Should You Upgrade Your Synology from DSM 7.2 to DSM 7.3?

DSM 7.3 represents Synology’s final major release under the DSM 7 platform before the expected transition to DSM 8, and it introduces a mix of refinements, policy reversals, and new enterprise tools that signal both the maturity and the approaching end of this software generation. The update arrives after an extended rollout period that began in mid-2025 and has been deployed gradually across supported NAS models to ensure stability. It brings several notable changes, most prominently the revision of the company’s restrictive hard drive policy under the new HCL 5.0 standard, allowing a broader range of third-party drives on 2025 Plus series systems. Other additions include the Synology Tiering package, designed to automate storage management between multiple NAS devices, and the introduction of the AI Console, a framework that integrates external AI and LLM providers into Synology’s productivity applications. Alongside these new components, DSM 7.3 also adds incremental updates such as native exFAT support, more flexible encryption handling, improved domain and directory management, and several kernel-level security patches.

However, for most existing users running DSM 7.2, the decision to upgrade should not be automatic. Many of the most visible features in DSM 7.3, including Synology Drive 4.0 and early versions of Synology Tiering, can already be accessed through separate beta packages on DSM 7.2 without performing a full system upgrade. Moreover, DSM 7.3 has arrived without a public beta phase, leading to mixed community feedback on compatibility issues and minor application regressions reported during early adoption. The release is stable for general use, but it represents an incremental refinement rather than a fundamental reinvention of Synology’s operating environment. For many users, DSM 7.3 serves as both a capstone for the current platform and a preparatory step toward the next-generation DSM 8 ecosystem expected to follow in 2026.

Should You Upgrade to Synology DSM 7.3? The TL;DR

For most existing Synology users, DSM 7.3 is a cautious, incremental update rather than a transformative one. It refines several areas—particularly in data security via vulnerability patches, encrypted storage handling, and drive compatibility—but few of these changes are critical for stable systems already running DSM 7.2. The improved drive policy on 2025 Plus models is a welcome reversal of the restrictive compatibility introduced earlier, yet older systems benefit little beyond quality-of-life improvements. Similarly, the new Synology Tiering and AI Console frameworks show potential but are limited in scope, requiring multi-system deployments or external AI integrations that do not suit typical home or small business users. In short, DSM 7.3 is reliable and functionally solid, but it introduces no must-have feature for those already content with DSM 7.2. Users with newer 2025 Plus series hardware, or those who need to take advantage of the new tiering, encryption, or administrative tools, can confidently upgrade once their model is supported. However, administrators running mission-critical workloads, media servers, or older legacy devices may prefer to wait until early 2026 for further stability updates or the initial DSM 8 previews. The release feels transitional—a final, polished step for the DSM 7 generation rather than a defining milestone—so unless your deployment directly benefits from one of its headline features, remaining on DSM 7.2 remains a perfectly reasonable choice.

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Will Upgrading to DSM 7.3 Remove My Ability to Hardware Transcode?

Upgrading to DSM 7.3 does not remove hardware transcoding support on systems that already possess compatible integrated graphics or dedicated GPU functionality. The removal of hardware transcoding drivers occurred earlier, during the rollout of DSM 7.2.2, and affected only specific 2025-generation NAS models where Synology chose to disable HEVC (H.265) hardware acceleration for licensing and driver maintenance reasons. For all older devices—such as the DS920+, DS423+, and DS224+—the upgrade to DSM 7.3 preserves existing transcoding capabilities, including both H.264 and H.265 conversions, assuming these were functional in DSM 7.2. Users can continue to use hardware-assisted video conversion in applications such as Synology Video Station (if you still have it!), Plex, and Jellyfin without additional configuration. No drivers are removed or replaced by the DSM 7.3 upgrade process, and GPU-accelerated workloads remain fully accessible. The only cautionary point applies to future NAS models that will ship with DSM 7.3 preinstalled, as these may already reflect Synology’s newer driver policy, but existing systems upgrading from DSM 7.2 retain their transcoding performance entirely unchanged. Just remember that Synology 2025 series devices that have an integrated graphics CPU do NOT have the graphics driver by default. Watch the video below to learn more:

Will Upgrading to DSM 7.3 Result in My M.2 SSDs Becoming Unsupported or Unusable?

For most users, upgrading to DSM 7.3 will not cause any change to M.2 SSD functionality. Systems that already have existing cache or storage configurations using M.2 NVMe drives in DSM 7.2 will continue to operate normally after the upgrade, with no data loss or drive disconnection. The update does not remove support for previously installed third-party NVMe SSDs, nor does it alter existing caching or volume structures.

However, DSM 7.3 maintains Synology’s restrictive stance on creating new NVMe-based storage pools (i.e only their own bradned drives currently) or caches using unverified drives. While the broader HCL 5.0 policy restores open drive usage for SATA HDDs and SSDs on the 2025 Plus series, it does not extend to M.2 NVMe media, which still require official validation to be initialised in new roles. Users upgrading from DSM 7.2 who already have third-party M.2 drives configured will see no functional difference, but those attempting to add or reassign new NVMe devices after the upgrade will remain subject to the same compatibility enforcement introduced in DSM 7.2.

Is Synology Drive 4.0 Worth Upgrading to DSM 7.3 For?

Synology Drive 4.0 introduces a collection of small but practical improvements that enhance team collaboration and file management, but none of these changes require DSM 7.3 to function. The new version adds improved file labelling and categorisation tools, making it easier for teams to assign colour-coded or custom tags to shared content.

It also refines file request functionality, allowing users to specify reasons for requesting access and to track these submissions more transparently. File locking has also been expanded, now supporting manual control in addition to automatic version locking, which prevents conflicts when multiple users are editing the same document.

Together, these updates improve workflow precision and traceability, particularly in shared office environments or remote teams using Drive as a private alternative to cloud collaboration platforms such as OneDrive or Google Drive.

Beyond these refinements, Synology Drive 4.0 also brings stronger integration with Synology Account authentication, a requirement for accessing its newest collaborative features. This includes cross-user label sharing, improved audit tracking, and the option to enforce identity binding for Drive users in larger deployments.

However, all of these capabilities remain accessible to DSM 7.2 users via Synology’s beta package program, meaning there is no requirement to upgrade to DSM 7.3 to test or use them. Unless you specifically need tighter Drive account linkage or plan to adopt other DSM 7.3-only features such as Tiering or AI Console integration, the Drive 4.0 update alone does not justify upgrading your NAS operating system.

Is Synology Tiering Worth Upgrading to DSM 7.3 For?

Synology Tiering is one of the most significant new features in DSM 7.3, introducing an automated data management system designed to move infrequently accessed files from fast “hot” storage to lower-cost “cold” storage across multiple NAS devices. The concept is similar to hierarchical storage management in enterprise systems, but unlike QNAP’s QTier, it does not operate within a single NAS.

Instead, it requires two or more Synology NAS units running DSM 7.3, with the hot tier hosting the primary, frequently used data, and the cold tier configured as a secondary vault where less active files are migrated. Administrators can create tiering plans that determine how long a file remains in the hot tier based on modification or access frequency, with policies ranging from one day to several years. Transfers occur automatically over encrypted HTTPS connections, and stub files are left behind in the hot tier to preserve accessibility, allowing users to recall files seamlessly when needed.

However, despite its potential, Synology Tiering remains a beta-stage feature with limited configuration depth and hardware support. Not all NAS systems qualify for hot-tier deployment, and the supported model lists are inconsistent. For example, the DS425+—a system without M.2 slots—supports hot-tier operation, whereas the DS923+, which features greater performance and expandability, does not. Likewise, several older Plus-series models and most rackmount units are limited to cold-tier functionality only.

The service currently lacks integration with Synology Drive, encrypted folders, or other key DSM services, meaning many shared folders cannot participate in tiering policies. While the feature offers promise for businesses managing distributed sites or large archives, it is still early in development and unsuitable as the sole reason to perform a DSM 7.3 upgrade. It can also be tested independently on DSM 7.2 via the beta package, allowing administrators to evaluate its practicality before committing to a full system migration.

It is worth noting that Synology’s allocation of which NAS systems qualify as hot-tier and cold-tier devices under DSM 7.3 results in some unusual distinctions between models. Several systems with similar or even higher technical specifications are listed only as cold-tier devices, while others with more modest hardware are fully approved for hot-tier functionality.

For example, the Intel Celeron-based DS225+, which supports only SATA HDDs and lacks M.2 NVMe or 10GbE connectivity, is officially designated as a hot-tier system. In contrast, the AMD Ryzen R1600-based DS923+, which includes dual M.2 NVMe slots and 10GbE upgradability, appears only on the cold-tier list.

This creates a noticeable mismatch between capability and feature assignment across both desktop and rackmount systems, suggesting that Synology’s tiering support matrix has been determined on a per-model basis rather than by hardware class.

Model Listings (as defined under DSM 7.3):

• Hot-tier supported systems:
  FS6400, FS3600, FS3410, FS3400, FS2500, FS200T, HD6500, SA3400D, SA3200D, SA6400, SA3610, SA3600, SA3410, SA3400, RS4021xs+, RS3621xs+, RS3621RPxs, RS2825RP+, DS3622xs+, DS1823xs+, DS1621xs+, DS1825+, DS1525+, DS925+, DS725+, DS425+, DS225+.

• Cold-tier supported systems:
  HD6500, FS6400, FS3600, FS3410, FS3400, FS2500, FS200T, SA3400D, SA3200D, SA6400, SA3610, SA3600, SA3410, SA3400, RS4021xs+, RS3621xs+, RS3621RPxs, RS2825RP+, RS2423RP+, RS2423+, RS2821RP+, RS2421RP+, RS2421+, RS1221RP+, RS1221+, RS822RP+, RS822+, RS820RP+, RS820+, RS422+, DS3622xs+, DS1823xs+, DS1621xs+, DS2422+, DS1825+, DS1821+, DS1621+, DS1525+, DS1522+, DS1520+, DS925+, DS923+, DS725+, DS723+, DS920+, DS720+, DS620slim, DS425+, DS423+, DS420+, DS225+, DS224+, DS220+, DVA1622, DVA3221.

The division between these two groups highlights some unexpected choices, where NAS models with more advanced configurations—such as integrated NVMe storage or faster network options—are limited to cold-tier participation, while smaller, SATA-only systems are permitted full hot-tier operation.

Are Synology AI Admin Console Services Worth Upgrading to DSM 7.3 For?

The Synology AI Console is a new administrative framework introduced in DSM 7.3 that allows NAS administrators to connect external artificial intelligence and large language model (LLM) services, such as OpenAI, Azure OpenAI, Google Gemini, and Amazon Bedrock, directly into select Synology productivity applications. Its purpose is to enhance tools like Synology MailPlus and Synology Office with text summarisation, translation, and content generation capabilities.

Rather than hosting AI workloads locally, the Console acts as a bridge between the NAS and third-party AI providers through user-supplied API keys. Administrators can control who can access these features, set daily or per-minute token limits to manage consumption, and monitor all requests via detailed transaction logs.

A privacy-focused de-identification mechanism can also be enabled to mask sensitive data—such as names, IP addresses, or account details—before it leaves the NAS for external processing, restoring it upon return.

While these controls demonstrate a well-considered security approach, the AI Console remains divisive. Because all AI requests are processed externally rather than on-device, the system sends portions of MailPlus and Office text content to third-party cloud providers for analysis and response generation.

Even with encryption and masking in place, this design conflicts with the expectations of users who adopt a NAS precisely to maintain full local control over data.

Moreover, the Console currently supports only text-based functions and does not provide local inference, on-device LLM hosting, or GPU-accelerated processing, which limits its appeal to professional or privacy-conscious users. For most home and small-business owners, the AI Console is an optional enhancement rather than a compelling reason to upgrade.

It may benefit organisations already running MailPlus or Office in a collaborative environment, but its dependence on external AI infrastructure means its inclusion in DSM 7.3 is unlikely to justify a system-wide update on its own.

A Pre-emptive Warning about DSM 7.3 and Synology RS / Rackstation and NVR / DVA Surveillance Systems

While DSM 7.3 restores third-party hard drive flexibility on the 2025 DiskStation Plus range, this policy change does not extend to RackStation (RS) or DVA/NVR systems. These models continue to enforce Synology’s restricted compatibility framework, requiring officially verified HAT, HAS, or SAT series drives for full SMART monitoring, health data reporting, and warranty-backed operation. Unverified drives may still function but typically appear with degraded status indicators, limited temperature or lifespan data, and persistent “incompatible” warnings within Storage Manager.

This limitation remains particularly relevant to surveillance deployments, as Synology has yet to certify common NVR-grade drives such as Seagate IronWolf, Seagate SkyHawk, or WD Purple series models. At the time of writing, only one 2025-generation RackStation has been released under this policy, but Synology is expected to expand the line-up significantly into Q1 2026, with new models such as the DVA7400, DVA3000, and additional 4- and 8-bay RS systems all expected to ship with DSM 7.3 pre-installed and to follow the same verified-drive enforcement. As such, administrators planning future rackmount or surveillance deployments should confirm drive support in advance, as Synology shows no signs of relaxing its enterprise compatibility standards for these product tiers.

Should You Upgrade to DSM 7.3? VERDICT

For most existing Synology users, DSM 7.3 stands as a careful, incremental evolution of the platform rather than a major overhaul. It introduces refinements in data protection, encryption handling, and administrative control while restoring a more open stance on third-party hard drive use under the new HCL 5.0 policy. These adjustments address several long-standing user concerns, particularly on the 2025 Plus series, where Synology has finally reintroduced full flexibility for HDD and SSD compatibility. However, outside of that reversal, DSM 7.3’s core updates—such as minor kernel improvements, user interface refinements, and system efficiency tweaks—represent evolutionary stability rather than innovation. The release also marks Synology’s first attempt to integrate AI-based administrative tools and multi-tier storage, but both features remain optional, niche in scope, and better suited to advanced users or multi-NAS deployments. For those running stable DSM 7.2 environments, the upgrade is beneficial but not essential, as few of the new capabilities materially alter day-to-day operations.

That said, DSM 7.3 remains a worthwhile step forward for users who want to align their systems with Synology’s next-generation framework before DSM 8’s eventual release. Owners of newer 2025 models such as the DS925+, DS1525+, or RS2825RP+ will likely find the update unavoidable, as it forms the baseline for upcoming package releases and extended security support. Administrators managing large data environments may also appreciate the improved directory integration, enhanced file versioning, and native exFAT support included in this release. Still, those relying on older Plus or XS-class devices for media, backup, or general storage tasks may prefer to wait for a few minor revisions before upgrading, allowing early adopters to expose any unforeseen issues. DSM 7.3 is polished and well-structured, but it feels transitional—a bridge between legacy DSM 7.2 deployments and the more modern, AI-aware infrastructure Synology is preparing for DSM 8. Unless you specifically require its new storage policies, tiering capabilities, or AI integration, remaining on DSM 7.2 remains a stable, low-risk option for the foreseeable future.

Which Systems Support the DSM 7.3 Upgrade? (Updated List)

The DSM 7.3 (version 7.3-81180) update is available as a manual download for an extensive range of Synology NAS systems, spanning the Plus, XS, SA, FS, HD, Value, and J series. Rollout continues in stages, meaning some users will not yet receive an automatic update notification. Once installed, DSM 7.3 cannot be downgraded to a previous version, and for many older models, it will be the final feature-bearing update, with future maintenance limited to security and stability patches.

The complete set of DSM 7.3 installation files, as listed in Synology’s October 2025 release, confirms support for virtually all NAS models released between 2016 and 2025. Key model families include:

DiskStation desktop systems:
DS1019+, DS116, DS118, DS119j, DS120j, DS124, DS1517+, DS1517, DS1520+, DS1522+, DS1525+, DS1618+, DS1621+, DS1621xs+, DS1817+, DS1817, DS1819+, DS1821+, DS1823xs+, DS1825+, DS216+, DS216, DS216+II, DS216j, DS216play, DS218+, DS218, DS218j, DS218play, DS220+, DS220j, DS223, DS223j, DS224+, DS225+, DS2419+, DS2419+II, DS2422+, DS3018xs, DS3617xs, DS3617xsII, DS3622xs+, DS416, DS416j, DS416play, DS416slim, DS418, DS418j, DS418play, DS419slim, DS420+, DS420j, DS423+, DS423, DS425+, DS620slim, DS716+, DS716+II, DS718+, DS720+, DS723+, DS725+, DS916+, DS918+, DS920+, DS923+, DS925+.

RackStation and enterprise systems:
RS1219+, RS1221+, RS1221RP+, RS1619xs+, RS18016xs+, RS18017xs+, RS217, RS2416+, RS2416RP+, RS2418+, RS2418RP+, RS2421+, RS2421RP+, RS2423+, RS2423RP+, RS2818RP+, RS2821RP+, RS2825RP+, RS3617RPxs, RS3617xs+, RS3617xs, RS3618xs, RS3621RPxs, RS3621xs+, RS4017xs+, RS4021xs+, RS422+, RS816, RS818+, RS818RP+, RS819, RS820+, RS820RP+.

Data-centre and performance platforms:
FS1018, FS2017, FS2500, FS3017, FS3400, FS3410, FS3600, FS6400, HD6500, SA3200D, SA3400, SA3400D, SA3410, SA3600, SA3610, SA6400.

Video analytics and surveillance models:
DVA1622, DVA3219, DVA3221.

Virtual DSM package:
VirtualDSM 7.3-81180.

This dataset confirms that DSM 7.3 has been compiled for almost every currently supported platform, with file sizes ranging from roughly 300 MB for entry-level systems (such as the DS120j and RS217) up to 430 MB for enterprise and FlashStation devices. Users operating 2025-generation systems such as the DS225+, DS425+, DS725+, DS925+, DS1525+, DS1825+, RS2825RP+, and SA3410 will receive DSM 7.3 pre-installed or as part of first-release firmware. For older devices dating back to 2016–2018, DSM 7.3 will act as the final major update before DSM 8 arrives in 2026.

Which Synology NAS will See DSM 7.3 as their LAST Major Synology Update?

The DSM 7.3 (version 7.3-81180) update is available for a wide range of Synology NAS models, though rollout is staged and certain older systems will remain on DSM 7.2 or earlier. It is important to note that DSM 7.3 will be the final major upgrade for many devices, after which they will continue to receive only security and maintenance patches. Users should also be aware that once installed, DSM 7.3 cannot be downgraded.

Models eligible for DSM 7.3 upgrade:
FS Series: FS3017, FS2017, FS1018
XS Series: RS18016xs+, RS4017xs+, RS3617xs+, RS3617xs, RS3617RPxs, RS18017xs+, DS3617xs, DS3617xsII, DS3018xs
Plus Series: RS2416RP+, RS2416+, DS916+, DS716+II, DS716+, DS216+II, DS216+, DS1817+, DS1517+, RS2818RP+, RS2418RP+, RS2418+, RS818RP+, RS818+, DS1618+, DS918+, DS718+, DS218+, RS1219+
Value Series: DS116, DS216, DS216play, DS416, DS416play, DS1517, DS1817, DS418play, RS217, RS816
J Series: DS216j, DS416j, DS416slim, DS419slim, DS418j, DS218j, DS119j

For these devices, DSM 7.3 represents the end of the feature update cycle, effectively marking the transition point toward DSM 8, which will accompany newer 2026 and later hardware. Users operating 2025-series NAS systems that are produced by Synology in 2026 (the DS225+, DS425+, DS725+, DS925+, DS1525+, DS1825+, and RS2825RP+) will receive DSM 7.3 by default and will likely be among the first to transition to DSM 8 once available.

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Is the Synology DS925+, DS1825+, DS1525+, etc NAS OK to Buy Now?

As this change in unverified hard drive support policy by Synology seems to be rolled out in the DSM 7.3 update, that means that currently if you buy and deply a Synology x25 generation NAS, you will still be subject to the restricted HDD deployment status of DSM right now (i.e cannot initialize, cannot RAID build, Rebuild, hot spare, etc unless using a Synology labelled drive or one that eventually might arrive on the compatibility list). So, if you buy the new Synology DS925+, DS1825+ or DS1525+ – unless you were already going to buy Synology hard drive and SSD media, you won’t be able to do very much out the box! So, if you are only considering a Synology NAS right now IF it can be used with 3rd party and/or unverified storage media – DO NOT BUY until the DSM 7.3 update rolls out! You will just be wasting some of your 3 year included warranty whilst you wait!

HOWEVER –If/When you do wish to purchase a Synology NAS, please do use the links below in order to purchase your NAS. Doing so results in a small commission coming to me and Ed here at NASCompares, and it allows us to keep doing what we do here, and is the most frictionless and zero-cost way for you to support our articles, reviews, videos, guides, support systems and more.

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Below are further videos from over the course of the last 6+ months that cover the evolution of Synology and this controversial hard drive support policy.

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Need Advice on Data Storage from an Expert?

Finally, for free advice about your setup, just leave a message in the comments below here at NASCompares.com and we will get back to you. Need Help? Where possible (and where appropriate) please provide as much information about your requirements, as then I can arrange the best answer and solution to your needs. Do not worry about your e-mail address being required, it will NOT be used in a mailing list and will NOT be used in any way other than to respond to your enquiry. [contact-form-7] TRY CHAT Terms and Conditions   Alternatively, why not ask me on the ASK NASCompares forum, by clicking the button below. This is a community hub that serves as a place that I can answer your question, chew the fat, share new release information and even get corrections posted. I will always get around to answering ALL queries, but as a one-man operation, I cannot promise speed! So by sharing your query in the ASK NASCompares section below, you can get a better range of solutions and suggestions, alongside my own.

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The Synology Hard Drive and SSD Support Change in DSM 7.3 Explained – What You Can/Cannot Do

With the release of DSM 7.3, Synology has formally introduced its latest and most detailed round of storage compatibility policies to date, outlining exactly which hard drives and solid-state drives are supported across its growing NAS product ecosystem. These updates arrive after several years of gradual tightening in Synology’s hardware validation process, which began in 2021 with the introduction of the HAT5300 and HAT3300 drives and became fully enforced in the 2024–2025 generation of devices. Under DSM 7.2, many of these newer systems—in particular the Plus series—were restricted to using Synology-branded drives only, effectively preventing users from creating storage pools with unverified third-party disks. This limitation led to considerable backlash from the community and power users who had relied on flexible drive choices for mixed or repurposed storage builds.

DSM 7.3 introduces a new structure to this policy, known internally as the HCL 5.0 framework, which partially relaxes those restrictions for 2025 model-year DiskStation Plus and J series NAS systems. It reinstates the ability to use non-listed hard drives and SATA SSDs for pool creation, while maintaining a degree of verification for higher-end systems such as the XS, SA, FS, and HD series. The update is significant because it rebalances Synology’s approach to drive validation, aligning reliability goals with user flexibility. In addition, DSM 7.3’s drive-handling system now displays clearer notifications within Storage Manager, differentiating between listed, unlisted, and incompatible drives, helping users understand the operational impact of their hardware choices before deploying them into active volumes or caches.

For professionals managing larger deployments, DSM 7.3 also provides expanded transparency on what Synology considers “verified reliability,” listing the precise categories of tests that certified drives undergo—thermal stress, power cycle endurance, and abnormal shutdown simulation—before being added to the official compatibility list. These details are especially relevant for IT administrators planning storage upgrades or migrations, as the new compatibility tables make it clear which drive types can be used in different Synology product families. This article breaks down the logic behind these changes, explains how Synology’s updated system reacts to various drive types, and clarifies which NAS lines now support third-party drives under DSM 7.3.

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Why Synology Has Changed Hard Drive and SSD Support in DSM 7.3?

When the Synology 2025 PLUS series launched in spring 2025, Synology’s decision to restrict many newer NAS models to officially approved Synology-branded drives marked a major turning point in the company’s storage policy, triggering widespread criticism across its user base. Systems like the DS923+ and DS1522+ suddenly required drives from Synology’s HAT or SAT ranges for creating new storage pools, leaving long-time users frustrated that they could no longer use trusted third-party disks from vendors such as Seagate or Western Digital. Synology’s explanation at the time centered on reliability: they claimed a growing number of support incidents were linked to unverified drives with unstable firmware, inconsistent temperature readings, or poor power recovery behavior. The aim was to unify performance standards across the portfolio and ensure that every supported configuration met enterprise-grade validation tests already used in their FS and SA lines. However, as the backlash grew throughout 2024 and early 2025, it became clear that many customers—especially small businesses and home users—felt alienated by this rigid policy. Some migrated to alternative NAS ecosystems, while others publicly voiced concerns about the long-term openness of Synology’s platform. In response, Synology developed a new compatibility framework known as HCL 5.0, introduced in DSM 7.3, to strike a balance between reliability and flexibility. This new approach reinstates the ability to use unlisted hard drives and 2.5-inch SATA SSDs for storage pool creation on 2025 DiskStation Plus, Value, and J series models, provided the drives are not explicitly marked as incompatible. Meanwhile, enterprise systems such as the FS, SA, XS, and HD ranges continue to enforce strict compatibility for mission-critical stability. Synology described this as a pragmatic evolution of its policy, aligning with customer expectations while continuing to collaborate with major drive manufacturers to validate additional models under its new testing program. The result is a hybrid policy that protects Synology’s enterprise reliability standards but restores much of the flexibility and user confidence that defined the brand’s earlier systems.

What Happens When a User Installs a Hard Drive That Is Not on the Compatibility List but Is Not on the Incompatibility List Either?

Under DSM 7.3, Synology has overhauled how its NAS systems handle drives that are not officially listed in the compatibility database but are also not explicitly marked as incompatible. This new policy, part of the HCL 5.0 framework, restores the flexibility that was largely lost with DSM 7.2. For users of 2025 DiskStation Plus models, including systems such as the DS1525+, DS925+, and DS725+, these drives are now treated as fully functional and supported for installation, storage pool creation, and volume management. When a non-listed HDD or SATA SSD is installed in these units, DSM 7.3 accepts it without generating warnings, restrictions, or “unverified” messages. The drive behaves identically to a fully approved model, and users can create new RAID arrays, expand existing volumes, and use all standard DSM features such as snapshots, encryption, and Hyper Backup. This marks a significant shift from DSM 7.2, which blocked pool creation entirely if the installed drive was not verified by Synology.

The only distinction that remains is on the support side rather than the user interface. While DSM 7.3 operates normally with these drives, Synology’s technical support team may limit assistance for issues proven to be caused by non-listed hardware. This distinction allows experienced users to use mixed or legacy drives at their discretion while maintaining a clear boundary of responsibility. From a practical standpoint, performance, drive telemetry, and reliability monitoring remain fully available, including S.M.A.R.T. analysis, temperature reporting, and bad sector scanning. Storage pools built with these drives are indistinguishable from those using Synology-validated models, which means users can freely upgrade or migrate without worrying about feature loss.

The only exceptions to this open policy involve M.2 NVMe drives and systems outside the Plus, Value, or J series. NVMe SSDs used for caching or storage pools still require official validation because they endure heavier sustained write loads and generate more heat under continuous NAS workloads. As a result, only listed M.2 models can be used for new cache or pool creation, though previously configured drives can still be migrated. Meanwhile, enterprise-oriented NAS lines such as the RS, FS, SA, and XS series continue to operate under stricter compatibility rules, where only officially listed drives can be used for new storage pool creation. In these systems, non-listed drives can sometimes be recognized for migration, but cannot participate in new arrays or cache volumes.

For most users, this means that DSM 7.3 on the 2025 Plus series finally restores the traditional Synology experience: the ability to use virtually any NAS-grade hard drive or 2.5-inch SSD without restriction. It also removes the previous generation’s unnecessary barriers that alienated long-term customers. Synology has positioned this change as a response to community feedback, reaffirming that flexibility can coexist with reliability. The HCL 5.0 framework is now the baseline for all new consumer and prosumer systems, signaling Synology’s partial return to an open and more user-friendly storage policy.

How Is Hard Drive Compatibility in DSM 7.3 on the Rackstation/RS and NVR/DVA Surveillance NAS Systems?

While the original restrictions are expected (though not wholy welcome) for enterprise-grade units, DSM 7.3 also applies similar limitations to rackmount Plus (RS+) and DVA/NVR models, which has generated frustration among users expecting parity with desktop Plus series devices. Systems such as the RS2423RP+, RS422+, and DVA1622 remain governed by a more conservative policy, where only drives on the compatibility list can be used for new pool creation, and unlisted HDDs are accepted only for migration. In contrast to the new, flexible policy introduced for 2025 DiskStation Plus models, these rackmount and surveillance systems do not yet benefit from the same relaxed rules. This distinction is particularly disappointing given that many surveillance-optimized HDDs—such as Seagate’s SkyHawk or IronWolf ranges—have not yet been verified by Synology for DVA or NVR units, leaving buyers with fewer officially supported choices despite these drives being purpose-built for similar workloads.

The DVA and NVR product lines further complicate matters because their operating environments rely heavily on consistent write performance and power management behavior. Synology’s internal reasoning is that drive validation for continuous surveillance recording requires more predictable I/O latency and lower error recovery times than typical NAS workloads. However, the practical impact is a reduced range of compatible disks, even when many third-party NAS or CCTV-specific drives are known to perform reliably under similar conditions. Until Synology expands its verification program to include these models, administrators deploying rackmount Plus or DVA systems must continue to rely exclusively on officially listed drives or accept limited migration-only functionality.

These restrictions highlight an ongoing inconsistency in Synology’s product ecosystem. DSM 7.3 offers broad flexibility and open drive use on desktop Plus series systems but maintains enterprise-grade rigidity across rackmount Plus and surveillance-focused models. For now, this gap means that users deploying DSM 7.3 on RS or DVA systems cannot benefit from the same simplified, user-friendly drive policy available to standard DiskStation Plus NAS units.

How Is Hard Drive Compatibility in DSM 7.3 on the FS, HD, SA, UC, XS+, XS, and DP Series?

In DSM 7.3, Synology continues to apply the most stringent validation rules across its enterprise and datacenter-class NAS platforms, which include the FS, HD, SA, UC, XS+, XS, RS, and DP series. These systems are built for environments where sustained uptime, predictable throughput, and long-term data integrity are non-negotiable. As a result, they rely entirely on Synology’s Enterprise Compatibility Framework, which only permits the use of drives that have been formally validated and listed on the official compatibility database. These listed drives undergo intensive reliability testing, including extended read/write stress cycles, multi-node redundancy simulations, and controlled recovery from power or network failures. DSM 7.3 enforces this framework to guarantee consistent behavior across RAID arrays and to ensure that firmware-level optimizations, such as error recovery timing and caching algorithms, work as designed with Synology’s proprietary storage stack.

For users of these enterprise models, drives fall into three possible states: listed, not listed, and incompatible. Listed drives are fully supported for installation, storage pool creation, caching, and migration. Drives that are not listed may still appear in Storage Manager but are limited to migration-only use, meaning they can be mounted if they come from an existing Synology system but cannot be initialized for new volumes or RAID groups. This allows data recovery or transition from legacy setups without granting full functionality. Meanwhile, drives on the incompatibility list are blocked entirely and cannot be used in any capacity. These restrictions are designed to prevent firmware mismatches or mechanical inconsistencies that could undermine array stability. In practice, this means that enterprise and rackmount models remain tied to the official drive ecosystem, often limited to Synology’s own HAT or HAS series drives or verified OEM equivalents.

In these product classes, DSM 7.3 also maintains a strict policy for cache and SSD usage. M.2 NVMe drives can only be used for caching or storage pools if they appear on the official compatibility list. Unlisted M.2 drives are detected by the system but cannot be assigned to any cache operation, even for testing purposes. Similarly, 2.5-inch SATA or SAS SSDs that are not verified cannot participate in new array creation, even though they may mount for migration. This conservative approach reflects Synology’s focus on maintaining data integrity over flexibility in its upper-tier systems, where downtime or data corruption can carry substantial business costs. DSM communicates these restrictions clearly during setup: any attempt to use an unsupported drive for new pool creation will trigger a warning explaining that the operation cannot proceed due to compatibility enforcement.

What are the benefits of Buying Synology-branded Hard Drives and SSDs?

In parallel with the policy adjustments introduced in DSM 7.3, Synology has also begun expanding a series of benefits and incentives aimed at customers who purchase Synology NAS systems together with Synology-branded storage media. These initiatives are part of the company’s ongoing effort to strengthen its vertically integrated ecosystem, ensuring optimal performance and reliability when all components come from the same source. In selected markets, buyers who purchase Synology HAT, HAS, or SAT series drives on the same invoice as their NAS hardware now receive extended warranty coverage of up to five years, administered directly through authorized distributors and resellers. In addition, Synology has introduced an Express Replacement program, allowing for immediate drive swaps during the warranty period without waiting for the defective unit to be shipped and inspected, effectively mirroring the convenience of a premium RMA service. These benefits are available at no extra cost when drives are purchased through approved channels. The initiative is designed to make Synology’s validated ecosystem more appealing to businesses seeking predictable lifecycle management and faster recovery in the event of hardware failure, while also providing an incentive for users to standardize on Synology-branded components rather than mixing third-party storage.

Head over to Blackvoid HERE to read Luka’s great write-up on DSM 7.3 below:

DSM 7.3 and Hard Drive / SSD Support Conclusion

DSM 7.3 might well represent the most comprehensive and transparent storage compatibility framework Synology has released to date (after years of obviscation and unclear messaging), but it also reinforces a clear divide between its consumer and enterprise platforms. The introduction of the HCL 5.0 policy marks a pragmatic shift from the heavily restricted DSM 7.1/7.2 model, restoring the flexibility that long-time users had relied on for more than a decade. On the 2025 DiskStation Plus series, users can once again install and operate any third-party NAS-grade HDD or SATA SSD without limitation, bringing back the open and adaptable system design that helped define Synology’s reputation. This balance between openness and validation shows the company’s recognition of user feedback and its effort to rebuild trust after widespread criticism of its earlier drive-locking policy. By maintaining full functionality for unlisted drives while still reserving strict validation for high-end hardware, DSM 7.3 offers a compromise that keeps consumer-grade systems practical and professional-grade systems predictable. Not ideal, but better than what was already in place.

However, DSM 7.3 also underlines the growing separation between Synology’s desktop Plus models and its rackmount Plus, DVA, and enterprise systems. While home and small-business users benefit from restored flexibility, administrators working with rackmount or surveillance solutions remain tied to tightly controlled drive lists. The continued exclusion of common NAS and NVR-grade drives—such as Seagate IronWolf and SkyHawk or WD Purple series—from the verified list limits adoption and drives up deployment costs, particularly for surveillance users who require high-capacity, continuous-write storage. Until Synology expands its validation program or aligns its rackmount Plus systems with the same drive-handling rules as its desktop equivalents, this divide will remain a sticking point. DSM 7.3 is therefore both a meaningful correction and a reminder that Synology’s storage policy continues to evolve in response to user pressure. It moves the platform back toward flexibility without abandoning its enterprise reliability philosophy, but the differences between product tiers are now more visible than ever.

Want to Support What We Do? Use the Links Below to Buy your NAS and/or HDD and SSD Media. Clicking these links will result in a small commission for anything you purchase, heading to me and Eddie @NASCompares and allows us to keep doing this! It’s just us two here and between this and ads, it’s the most passive way to keep us sailing! Thanks

Synology NAS and Media on Amazon – HERE Synology Products on B&H – HERE Seagate Ironwolf Media on Amazon – HERE WD Red Media on Amazon – HERE Seagate Products on B&H – HERE WD Products on B&H – HERE

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This description contains links to Amazon. These links will take you to some of the products mentioned in today's content. As an Amazon Associate, I earn from qualifying purchases. Visit the NASCompares Deal Finder to find the best place to buy this device in your region, based on Service, Support and Reputation - Just Search for your NAS Drive in the Box Below

Need Advice on Data Storage from an Expert?

Finally, for free advice about your setup, just leave a message in the comments below here at NASCompares.com and we will get back to you. Need Help? Where possible (and where appropriate) please provide as much information about your requirements, as then I can arrange the best answer and solution to your needs. Do not worry about your e-mail address being required, it will NOT be used in a mailing list and will NOT be used in any way other than to respond to your enquiry. [contact-form-7] TRY CHAT Terms and Conditions   Alternatively, why not ask me on the ASK NASCompares forum, by clicking the button below. This is a community hub that serves as a place that I can answer your question, chew the fat, share new release information and even get corrections posted. I will always get around to answering ALL queries, but as a one-man operation, I cannot promise speed! So by sharing your query in the ASK NASCompares section below, you can get a better range of solutions and suggestions, alongside my own.

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Synology (FINALLY) Gives In to 3rd Party HDD Support in 2025 PLUS Series NAS

7/10/25 – Updated with information supplied by Synology on how verifications and product ranges will support different HDD/SSD in DSM 7.3

Of all the stories of 2025, very few had the level of impact on the NAS industry that the Hard Drive support policy change by Synology did. Arguably THE name in the world of turnkey NAS, Synology enjoyed a fairly spotless reputation up until recent years, but when their gradual first-party support stance took a very drastic acceleration in April 2025 with a complete lockout of HDDs from Seagate and WD for their 2025 generation of hardware, the industry responded very, very unfavourably (Ed – understatement of the YEAR). Over the months that followed, even some of the biggest tech platforms and consumer rights focused media outlets on the internet made damning statements about the brand’s actions, previously very Synology-friendly outlets either criticised the move or simply ceased covering Synology, and even typically heavily supportive Synology-associated platforms such as the Synology subreddit and yes even here at NASCompares were keen to highlight every inconsistent turn of this story. After six months of heavy fire, undoubtedly poor sales of the 7–8 released Synology 2025 generation hardware launches in that time (eg DS925+, DS1825+, DS425+, etc), repeated missteps by the brand in user engagement (such as disabling comments on videos, contradictory press statements and baffling justifications around hardware)… now… NOW the brand has announced that you will once again be able to use Seagate and WD Hard Drives on the Synology 2025 generation of devices – and importantly, this time without the level of shouted alerts and warnings. So, let’s discuss when this WD and Seagate Hard Drive media support is coming back, what are the limits, is this too little too late and whether all this was ever worth it for Synology.

When and How Will Third-Party Hard Drive Support Return to the 2025 Synology NAS?

Synology has detailed that third-party hard drive support will return to 2025 devices alongside the rollout of DSM 7.3, the next major update to the Synology software platform. Unlike previous statements earlier this year, this U-turn now means that Seagate and WD drives will not only be usable again but also with a significant reduction (possibly even complete removal – still awaiting exact testing of DSM 7.3 ourselves) from the constant “unverified drive” and “at risk” warnings that plagued users. This represents a return to the compatibility model users were familiar with before 2025. Exact rollout dates of the DSM 7.3 update are still pending (likely Q4 2025 or early Q1 2026), but this will mark the point where Synology’s 2025 NAS systems no longer block unsupported drives at installation. Until that update arrives and users proceed with it’s installation, Synology 2025 systems will of course still not allow unconfirmed media to initialise DSM. Likewise, it remains unclear how the update will interact with users who have already employed community scripts to bypass restrictions – whether these fixes will still be needed, or whether DSM 7.3 will overwrite them entirely.

Another important detail is how far this reinstated compatibility extends. According to Synology’s new position in the DSM 7.3 rollout, users will again be able to initialise DSM, create storage pools, volumes, run disk checks, expand pools, perform RAID repairs and create hot spare disks – essentially restoring the same functionality that was lost earlier this year. Crucially, the obtrusive warning messages that previously accompanied unsupported drives will be removed, which means the user experience should be indistinguishable from older Synology generations. Synology has stated that testing of specific Seagate and WD drives was still “ongoing” in the last 6 months, but this appears largely academic now, since DSM 7.3 will no longer enforce the same restrictions. Which brings into question the validity of those claims. In practice though, this means users can once again choose from the wider drive market, without fear of blocked features or disruptive alerts. It is still not 100% clear on what the position regarding M.2 NVMe SSDs and Storage Pool use will be, as well as if this is going to be completely brand wide – or just affecting the PLUS series new and old that are eligible for the DSM 7.3 update.

The Alerts and ‘Warnings’ that users have gotten used to up tll now (i.e pre DSM 7.3 roll out):

To confirm, the current 2025 systems that primarily this Synology U-turn on Hard Drive compatibility in DSM would affect are:

• Synology DS925+
• Synology DS1525+
• Synology DS725+
• Synology DS1825+
• Synology DS425+
• Synology DS225+
• Synology RS2825RP+

Previous PLUS series devices did not arrive with the exceedingly strict ‘no verified = no initialization’ rule that the above system’s had, so although these will benefit in DSM 7.3 with lessened warnings that they currently had, it is not the deal breaker proposition that it is/was in the x25 series.

However, let’s return to the point. Was ALL of this chaos by Synology worth it? Was there actually a coherent strategy in place here? Let’s discuss the damage that the last 6 months have caused.

What Happens When a User Installs a Hard Drive That Is Not on the Compatibility List but Is Not on the Incompatibility List Either?

Under DSM 7.3, Synology has overhauled how its NAS systems handle drives that are not officially listed in the compatibility database but are also not explicitly marked as incompatible. This new policy, part of the HCL 5.0 framework, restores the flexibility that was largely lost with DSM 7.2. For users of 2025 DiskStation Plus models, including systems such as the DS1525+, DS925+, and DS725+, these drives are now treated as fully functional and supported for installation, storage pool creation, and volume management. When a non-listed HDD or SATA SSD is installed in these units, DSM 7.3 accepts it without generating warnings, restrictions, or “unverified” messages. The drive behaves identically to a fully approved model, and users can create new RAID arrays, expand existing volumes, and use all standard DSM features such as snapshots, encryption, and Hyper Backup. This marks a significant shift from DSM 7.2, which blocked pool creation entirely if the installed drive was not verified by Synology.

The only distinction that remains is on the support side rather than the user interface. While DSM 7.3 operates normally with these drives, Synology’s technical support team may limit assistance for issues proven to be caused by non-listed hardware. This distinction allows experienced users to use mixed or legacy drives at their discretion while maintaining a clear boundary of responsibility. From a practical standpoint, performance, drive telemetry, and reliability monitoring remain fully available, including S.M.A.R.T. analysis, temperature reporting, and bad sector scanning. Storage pools built with these drives are indistinguishable from those using Synology-validated models, which means users can freely upgrade or migrate without worrying about feature loss.

The only exceptions to this open policy involve M.2 NVMe drives and systems outside the Plus, Value, or J series. NVMe SSDs used for caching or storage pools still require official validation because they endure heavier sustained write loads and generate more heat under continuous NAS workloads. As a result, only listed M.2 models can be used for new cache or pool creation, though previously configured drives can still be migrated. Meanwhile, enterprise-oriented NAS lines such as the RS, FS, SA, and XS series continue to operate under stricter compatibility rules, where only officially listed drives can be used for new storage pool creation. In these systems, non-listed drives can sometimes be recognized for migration, but cannot participate in new arrays or cache volumes.

For most users, this means that DSM 7.3 on the 2025 Plus series finally restores the traditional Synology experience: the ability to use virtually any NAS-grade hard drive or 2.5-inch SSD without restriction. It also removes the previous generation’s unnecessary barriers that alienated long-term customers. Synology has positioned this change as a response to community feedback, reaffirming that flexibility can coexist with reliability. The HCL 5.0 framework is now the baseline for all new consumer and prosumer systems, signaling Synology’s partial return to an open and more user-friendly storage policy.

How Is Hard Drive Compatibility in DSM 7.3 on the Rackstation/RS and NVR/DVA Surveillance NAS Systems?

While the original restrictions are expected (though not wholy welcome) for enterprise-grade units, DSM 7.3 also applies similar limitations to rackmount Plus (RS+) and DVA/NVR models, which has generated frustration among users expecting parity with desktop Plus series devices. Systems such as the RS2423RP+, RS422+, and DVA1622 remain governed by a more conservative policy, where only drives on the compatibility list can be used for new pool creation, and unlisted HDDs are accepted only for migration. In contrast to the new, flexible policy introduced for 2025 DiskStation Plus models, these rackmount and surveillance systems do not yet benefit from the same relaxed rules. This distinction is particularly disappointing given that many surveillance-optimized HDDs—such as Seagate’s SkyHawk or IronWolf ranges—have not yet been verified by Synology for DVA or NVR units, leaving buyers with fewer officially supported choices despite these drives being purpose-built for similar workloads.

The DVA and NVR product lines further complicate matters because their operating environments rely heavily on consistent write performance and power management behavior. Synology’s internal reasoning is that drive validation for continuous surveillance recording requires more predictable I/O latency and lower error recovery times than typical NAS workloads. However, the practical impact is a reduced range of compatible disks, even when many third-party NAS or CCTV-specific drives are known to perform reliably under similar conditions. Until Synology expands its verification program to include these models, administrators deploying rackmount Plus or DVA systems must continue to rely exclusively on officially listed drives or accept limited migration-only functionality.

These restrictions highlight an ongoing inconsistency in Synology’s product ecosystem. DSM 7.3 offers broad flexibility and open drive use on desktop Plus series systems but maintains enterprise-grade rigidity across rackmount Plus and surveillance-focused models. For now, this gap means that users deploying DSM 7.3 on RS or DVA systems cannot benefit from the same simplified, user-friendly drive policy available to standard DiskStation Plus NAS units.

How Is Hard Drive Compatibility in DSM 7.3 on the FS, HD, SA, UC, XS+, XS, and DP Series?

In DSM 7.3, Synology continues to apply the most stringent validation rules across its enterprise and datacenter-class NAS platforms, which include the FS, HD, SA, UC, XS+, XS, RS, and DP series. These systems are built for environments where sustained uptime, predictable throughput, and long-term data integrity are non-negotiable. As a result, they rely entirely on Synology’s Enterprise Compatibility Framework, which only permits the use of drives that have been formally validated and listed on the official compatibility database. These listed drives undergo intensive reliability testing, including extended read/write stress cycles, multi-node redundancy simulations, and controlled recovery from power or network failures. DSM 7.3 enforces this framework to guarantee consistent behavior across RAID arrays and to ensure that firmware-level optimizations, such as error recovery timing and caching algorithms, work as designed with Synology’s proprietary storage stack.

For users of these enterprise models, drives fall into three possible states: listed, not listed, and incompatible. Listed drives are fully supported for installation, storage pool creation, caching, and migration. Drives that are not listed may still appear in Storage Manager but are limited to migration-only use, meaning they can be mounted if they come from an existing Synology system but cannot be initialized for new volumes or RAID groups. This allows data recovery or transition from legacy setups without granting full functionality. Meanwhile, drives on the incompatibility list are blocked entirely and cannot be used in any capacity. These restrictions are designed to prevent firmware mismatches or mechanical inconsistencies that could undermine array stability. In practice, this means that enterprise and rackmount models remain tied to the official drive ecosystem, often limited to Synology’s own HAT or HAS series drives or verified OEM equivalents.

In these product classes, DSM 7.3 also maintains a strict policy for cache and SSD usage. M.2 NVMe drives can only be used for caching or storage pools if they appear on the official compatibility list. Unlisted M.2 drives are detected by the system but cannot be assigned to any cache operation, even for testing purposes. Similarly, 2.5-inch SATA or SAS SSDs that are not verified cannot participate in new array creation, even though they may mount for migration. This conservative approach reflects Synology’s focus on maintaining data integrity over flexibility in its upper-tier systems, where downtime or data corruption can carry substantial business costs. DSM communicates these restrictions clearly during setup: any attempt to use an unsupported drive for new pool creation will trigger a warning explaining that the operation cannot proceed due to compatibility enforcement.

What are the benefits of Buying Synology-branded Hard Drives and SSDs?

In parallel with the policy adjustments introduced in DSM 7.3, Synology has also begun expanding a series of benefits and incentives aimed at customers who purchase Synology NAS systems together with Synology-branded storage media. These initiatives are part of the company’s ongoing effort to strengthen its vertically integrated ecosystem, ensuring optimal performance and reliability when all components come from the same source. In selected markets, buyers who purchase Synology HAT, HAS, or SAT series drives on the same invoice as their NAS hardware now receive extended warranty coverage of up to five years, administered directly through authorized distributors and resellers. In addition, Synology has introduced an Express Replacement program, allowing for immediate drive swaps during the warranty period without waiting for the defective unit to be shipped and inspected, effectively mirroring the convenience of a premium RMA service. These benefits are available at no extra cost when drives are purchased through approved channels. The initiative is designed to make Synology’s validated ecosystem more appealing to businesses seeking predictable lifecycle management and faster recovery in the event of hardware failure, while also providing an incentive for users to standardize on Synology-branded components rather than mixing third-party storage.

Head over to Blackvoid HERE to read Luka’s great write-up on DSM 7.3 below:

Is it Too Little, Too Late? Is the Damage to the Synology Brand Already Done?

It’s a valid point. As mentioned in the intro, Synology has been a brand that, short of a few knocks along the way, has had a sterling reputation. Although their hardware has often been a little underwhelming, the software and services have been largely A1. But the move by Synology in restricting the use of drives from brands such as Seagate and WD burned A LOT of bridges. One cannot imagine that Western Digital or Seagate Technology were especially pleased by the rebuke either. The backlash was immediate and huge. Numerous sources I have spoken to in Europe and the U.S regarding Synology PLUS series sales (even for the 2023/22/21 ranges) confirmed the same sentiment: “Synology Diskstation sales were at a fraction of the previous year.” How much these support changes impacted enterprise solutions is unconfirmed, but given the number of sys-admins who quietly admitted to changing their buying plans, and sales teams who admitted recommending other vendors when Synology quotes became less competitive, the damage over the last 6 months has been palpable.

However, what about the next six months? Or the next 12 or 24? The timing of Synology’s disastrous hard drive support policy flip-flop could hardly have been worse. Alongside tech buyers (home and business) having tighter budgets due to rising costs, international trade tariffs being debated, new players entering the NAS industry, and rising expectations of what a system should do, Synology could not have chosen a worse moment for an unpopular policy. Many users who saw the way the policy was rolled out interpreted it as “the writing on the wall” and changed their stance on the brand. Some already jumped ship to alternative vendors, and others opted for older Synology hardware from pre-2025 ranges to avoid the lockout. For those buyers, the fact that the restrictions are now being removed will feel like a bitter twist – they could have had the newer hardware with the same freedom if they had simply waited a little longer.

How much of this shift can be attributed to public and media backlash is hard to quantify, but the scale of the U-turn speaks for itself. This is not the first time Synology has reversed course under pressure. Back in 2021/22, when DSM 7.0 introduced the earliest versions of its compatibility enforcement with red critical warnings, the outcry forced a retreat in DSM 7.1 to amber warnings instead (read here). History has now repeated itself on a much bigger stage. The difference is that this time, months of poor reviews, negative coverage, and lost sales will remain part of the public record, and Synology will struggle to erase that damage.

Much like QNAP and its long-running association with Deadbolt ransomware attacks, Synology may find that users do not easily forget this saga. For months, the internet has been awash with angry comments, critical reviews, and valid frustration at the brand’s direction. Even with DSM 7.3 restoring full drive freedom, the stigma of this six-month debacle will linger. Some users will never return. Others will approach Synology with renewed caution, mindful that the company could change course again in the future. The reaction from existing and potential Synology PLUS series NAS users was loud enough that I felt compelled to make two videos SPECIFICALLY because users were DM’ing and commenting about why I/NASCompares was continuing in our coverage of this brand:

Is the Synology DS925+, DS1825+, DS1525+, etc NAS OK to Buy Now?

As this change in unverified hard drive support policy by Synology seems to be rolled out in the DSM 7.3 update, that means that currently if you buy and deply a Synology x25 generation NAS, you will still be subject to the restricted HDD deployment status of DSM right now (i.e cannot initialize, cannot RAID build, Rebuild, hot spare, etc unless using a Synology labelled drive or one that eventually might arrive on the compatibility list). So, if you buy the new Synology DS925+, DS1825+ or DS1525+ – unless you were already going to buy Synology hard drive and SSD media, you won’t be able to do very much out the box! So, if you are only considering a Synology NAS right now IF it can be used with 3rd party and/or unverified storage media – DO NOT BUY until the DSM 7.3 update rolls out! You will just be wasting some of your 3 year included warranty whilst you wait!

HOWEVER –If/When you do wish to purchase a Synology NAS, please do use the links below in order to purchase your NAS. Doing so results in a small commission coming to me and Ed here at NASCompares, and it allows us to keep doing what we do here, and is the most frictionless and zero-cost way for you to support our articles, reviews, videos, guides, support systems and more.

Synology DS925+ NAS	Synology DS1525+ NAS	Synology DS1825+ NAS
Check Amazon in Your Region for the Synology DS925+ NAS	Amazon in Your Region for the Synology DS1525+ NAS @ $799	Amazon in Your Region for the Synology DS1825+ NAS @ $1149
heck B&H for the Synology DS925+ NAS	B&H for the Synology DS1525+ NAS @ $1149.99	B&H for the Synology DS1825+ NAS @ $1149.99

 

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Below are further videos from over the course of the last 6+ months that cover the evolution of Synology and this controversial hard drive support policy.

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This description contains links to Amazon. These links will take you to some of the products mentioned in today's content. As an Amazon Associate, I earn from qualifying purchases. Visit the NASCompares Deal Finder to find the best place to buy this device in your region, based on Service, Support and Reputation - Just Search for your NAS Drive in the Box Below

Need Advice on Data Storage from an Expert?

Finally, for free advice about your setup, just leave a message in the comments below here at NASCompares.com and we will get back to you. Need Help? Where possible (and where appropriate) please provide as much information about your requirements, as then I can arrange the best answer and solution to your needs. Do not worry about your e-mail address being required, it will NOT be used in a mailing list and will NOT be used in any way other than to respond to your enquiry. [contact-form-7] TRY CHAT Terms and Conditions   Alternatively, why not ask me on the ASK NASCompares forum, by clicking the button below. This is a community hub that serves as a place that I can answer your question, chew the fat, share new release information and even get corrections posted. I will always get around to answering ALL queries, but as a one-man operation, I cannot promise speed! So by sharing your query in the ASK NASCompares section below, you can get a better range of solutions and suggestions, alongside my own.

WE LOVE COFFEE

 

Is there a good reason for Synology to change the support of “Unverified Drives” in DSM?

Synology has long been regarded as one of the most user-friendly and reliable NAS brands in the market, balancing intuitive software with a wide hardware range that appeals to both home and business users. However, in recent years the company has taken an increasingly controversial path by enforcing strict compatibility requirements for hard drives and SSDs. Beginning with DSM 7 and escalating into the 2025 generation of devices, Synology now only certifies and supports its own branded storage media, effectively locking out many widely used alternatives from Seagate, Western Digital, and Toshiba. While Synology positions this move as a way to ensure system stability and consistency, the decision has sparked significant backlash among users who feel restricted in their options and burdened by higher costs. As competitors expand their ecosystems with more openness and flexibility, this proprietary approach risks damaging Synology’s reputation, raising questions about whether the company has prioritized profit margins over user choice.

What is the MAIN PROBLEM(s) with this decision by Synology?

The most immediate problem with Synology’s hard drive policy is the loss of flexibility that once made their systems so appealing. For years, customers could select from a wide range of industry-standard drives from Seagate, Western Digital, or Toshiba, tailoring storage to their budget, performance requirements, or regional availability. This freedom not only allowed users to balance cost and capacity, but also gave small businesses and home enthusiasts the ability to reuse existing drives, upgrade incrementally, or take advantage of promotions from different vendors. By restricting DSM compatibility to Synology-labelled drives, that flexibility is gone. For many users outside major markets, Synology’s drives are harder to source, priced higher than the competition, or limited in available capacities. What once felt like an open platform now increasingly resembles a closed ecosystem, where users must accept the vendor’s terms even if it means compromising on affordability or performance.

Another dimension of the problem lies in how Synology has communicated these changes, which many see as evasive or disingenuous. Officially, the company justifies the restriction as a move toward greater reliability and predictable system performance. The argument is that by narrowing the range of drives tested and supported, Synology can optimize DSM to work seamlessly with drives that have firmware tailored for its environment. In practice, though, the same underlying hardware often originates from Seagate or Toshiba, with only minor firmware adjustments and new branding. This creates a perception that Synology is overstating the technical benefits while quietly using the policy to secure higher margins. For long-time users, the contrast is stark: older models happily ran third-party drives with few issues, which makes the sudden insistence on “certification” seem less like an engineering requirement and more like a business maneuver. The result has been a significant erosion of trust between the company and its community.

The wider impact of this strategy has also been felt across the storage industry. Resellers have reported declining sales of Synology’s Plus series devices as customers explore alternatives such as QNAP, TrueNAS, or newer entrants like UGREEN and UniFi. For Synology, this shift is particularly damaging because its reputation has historically rested on attracting less technical buyers who value simplicity and reliability over DIY solutions. Now, even these entry-level and mid-range users are questioning whether they should commit to an ecosystem that limits their choice of drives and increases their costs. At the same time, hard drive manufacturers like Seagate and Western Digital are also affected, as Synology’s decision reduces the number of channels through which their products reach end customers. The ripple effect is therefore twofold: Synology risks alienating its base of loyal customers, while storage vendors lose a once-reliable partner, creating tension that could ultimately push more buyers toward competing NAS brands.

How Can Synology Solve This (if they want to)?

One path forward for Synology would be to adopt a hybrid compatibility model, where its own branded drives remain the recommended or default choice but third-party alternatives are still officially supported. This compromise has been proven by other vendors such as UniFi and QNAP, who sell their own labelled drives while maintaining compatibility lists for major manufacturers like Seagate, Western Digital, and Toshiba. By following this model, Synology could continue promoting the reliability benefits of its branded hardware without alienating customers who prefer flexibility. In practice, this would preserve a sense of choice for users while ensuring Synology can still highlight its “optimized” solutions as the safer, supported route.

 

 

Finally, Synology could address the availability and pricing concerns around its own branded drives. In many regions, these drives are either difficult to source or significantly more expensive than equivalent Seagate or Western Digital models. Improving distribution channels, ensuring consistent stock, and narrowing the price gap would make the transition more palatable to users who are willing to adopt Synology’s ecosystem but feel penalized by limited access. By focusing on accessibility and fairness rather than exclusivity, Synology could rebuild goodwill while still driving revenue from its hardware strategy. Taken together, these steps would not fully reverse the controversy but would demonstrate responsiveness and provide a clearer path to balancing stability, customer choice, and profitability.

Is there a way to FORCE a Synology NAS to accept unverified Hard Drives and SSDs in DSM?

For users unwilling to accept Synology’s restrictive stance on storage media, the community has developed reliable workarounds that re-enable full functionality for third-party hard drives and SSDs. The most widely adopted method involves injecting a script into the NAS system that bypasses DSM’s compatibility database, allowing otherwise unsupported drives to be used for installation, storage pools, caching, and expansion. Synology’s 2025 Plus-series models, such as the DS925+, block DSM installation if only unverified drives are present and issue constant warnings in Storage Manager. To overcome this, users first employ a Telnet-based flag during initial setup that tricks DSM into accepting the installation, followed by a more permanent fix applied through SSH. At the heart of this solution is Dave Russell’s (007revad) GitHub project Synology_HDD_db, which modifies DSM’s internal drive compatibility files. Once downloaded and executed via SSH, the script detects the NAS model, DSM version, and connected drives, then patches the system to treat them as officially supported.

The process is reversible, non-destructive, and works across multiple DSM versions, including DSM 7.2 and later. Additional features allow removal of persistent warning banners, full use of NVMe drives as storage volumes, and optional disabling of intrusive monitoring services like WDDA. To ensure ongoing stability, users can also configure a scheduled task in DSM’s Task Scheduler that re-applies the script at every boot, guaranteeing compatibility survives updates, reboots, or new drive insertions. While the script is robust and actively maintained, there are clear disclaimers: using it involves modifying system files, may void official Synology support, and should only be attempted by users confident with SSH and terminal commands who have reliable data backups. Nonetheless, for advanced users, system integrators, and enthusiasts, this community-driven solution has become the de facto method of restoring the freedom to use affordable and widely available third-party drives in modern Synology NAS systems.

Example of a 30TB Seagate HDD visible and functioning inside a Synology DS925+

Note – You can follow my guide on how to use this script modification (as well as outlining the pros and cons) HERE on the blog, or watch the video below:

The Future of Synology in the eyes of new and old buyers?

Synology’s decision to enforce exclusive support for its own branded hard drives and SSDs marks one of the most controversial shifts in the company’s history, transforming how both long-time customers and potential buyers view the brand. For over a decade, Synology’s appeal rested on a combination of intuitive software, solid hardware, and flexibility in allowing users to choose their own storage media from trusted vendors like Seagate, Toshiba, and Western Digital. By removing that choice in the 2025 generation, Synology has fundamentally altered the value proposition of its systems, making them appear less like open storage platforms and more like tightly controlled appliances. While the company justifies the policy by citing stability, predictability, and reduced support overhead, many users interpret it as a profit-driven attempt to push proprietary drives into the market, especially since these are often rebranded versions of third-party disks with modified firmware and higher price tags.

The backlash has been considerable, with resellers and community forums reporting falling interest in Synology’s Plus-series devices, particularly among home and small business users who previously embraced them for affordability and ease of expansion. Competing NAS providers such as QNAP, TrueNAS, UGREEN, and UniFi have been quick to capitalize on the discontent, positioning themselves as more open alternatives that maintain compatibility with industry-standard drives. At the same time, the growth of unofficial solutions like Dave Russell’s compatibility script demonstrates how determined users are to regain control over their hardware, even at the risk of voiding warranty or stepping outside official support. This dynamic reflects a widening gap between Synology’s official direction and the needs of its customer base, many of whom would prefer to accept a disclaimer about using unverified drives rather than being forced into a closed ecosystem.

Ultimately, Synology now stands at a crossroads that will define its reputation in the storage industry for years to come. If it continues to double down on a closed, proprietary model, the company may secure short-term revenue through drive sales but risks long-term damage to its image and market share. On the other hand, reintroducing a more flexible, transparent approach—such as allowing user consent for unsupported drives or improving global pricing and availability of its own disks—could restore trust and preserve its standing as the NAS brand of choice for both novices and professionals. The availability of community workarounds ensures that frustrated users are not entirely locked out of their systems, but the very existence of these tools highlights how far Synology has drifted from its once customer-first ethos. The next few years will be crucial, as the company either adjusts course and strikes a balance between profitability and user freedom, or risks ceding ground to rivals who are eager to embrace the openness Synology has chosen to leave behind.

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Need Advice on Data Storage from an Expert?

Finally, for free advice about your setup, just leave a message in the comments below here at NASCompares.com and we will get back to you. Need Help? Where possible (and where appropriate) please provide as much information about your requirements, as then I can arrange the best answer and solution to your needs. Do not worry about your e-mail address being required, it will NOT be used in a mailing list and will NOT be used in any way other than to respond to your enquiry. [contact-form-7] TRY CHAT Terms and Conditions   Alternatively, why not ask me on the ASK NASCompares forum, by clicking the button below. This is a community hub that serves as a place that I can answer your question, chew the fat, share new release information and even get corrections posted. I will always get around to answering ALL queries, but as a one-man operation, I cannot promise speed! So by sharing your query in the ASK NASCompares section below, you can get a better range of solutions and suggestions, alongside my own.

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Use Whatever Hard Drives or SSDs on Your Synology NAS (2025 Guide)

Note – there is a YouTube tutorial version of this guide HERE on the NASCompares YouTube Channel

Synology’s 2025 generation of NAS systems, such as the DS925+ and other Plus series models, introduced a more restrictive approach to drive compatibility. Unlike previous generations, these devices enforce a compatibility check that blocks or limits functionality when non-Synology hard drives or SSDs are used. As a result, users are unable to install DSM, create storage pools, or configure caching volumes using unverified drives. Even drives that work in earlier Synology models are now flagged as unsupported, resulting in persistent alerts or outright refusal to function. This guide provides a complete walkthrough for users who want to bypass those restrictions and enable full usage of third-party SATA and NVMe drives, including for pools, volumes, hot spares, and cache. It includes step-by-step instructions on how to install DSM with only unverified drives, how to remove system warnings, and how to automate the process for future updates or drive additions. The solutions here rely on trusted scripts developed by the Synology community and require minimal system modification, allowing users to regain control over their own hardware.

Special Thanks to Dave Russell

The ability to bypass Synology’s restrictive drive compatibility checks would not be possible without the extensive work of Dave Russell, widely known in the Synology community as 007revad. His GitHub project, Synology_HDD_db, is the basis for all the procedures outlined in this guide. The script he developed modifies DSM’s internal compatibility database, enabling full functionality for otherwise unsupported HDDs, SSDs, and NVMe drives. Dave has not only written and maintained this complex script, but also ensured that it works across different NAS models and DSM versions, including DSM 7.2 and newer. He continues to improve the tool in response to Synology firmware changes, regularly providing updates and extended options such as M.2 volume support and WDDA disablement. Users are strongly encouraged to consult the official GitHub repository, follow the provided documentation, and, where possible, support his ongoing work HERE, which remains freely available to the broader NAS community.

MASSIVE Disclaimer

Modifying your Synology NAS to allow the use of unverified drives is not officially supported by Synology. By applying the changes described in this guide, you will be altering system files and bypassing built-in compatibility checks within DSM. While these changes are reversible and have been widely tested, doing so may void your Synology warranty or affect your ability to receive technical support from the manufacturer, even in cases unrelated to storage. Additionally, although the script-based method described here is non-destructive and has proven safe for many users, there is always a minimal risk of issues following DSM updates or hardware changes. You should not proceed unless you have full backups of your data and are comfortable with SSH and terminal operations. This guide is intended for advanced users, system integrators, or home NAS enthusiasts who understand the risks and accept responsibility for operating outside of official Synology support channels.

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How to Set Up a Synology NAS with No Drives Installed to Allow DSM Installation

Synology’s 2025 and later Plus-series NAS systems will not allow DSM installation if only unverified drives are present. However, it is possible to bypass this limitation and install DSM without using any Synology-branded or officially supported drives. The method involves enabling Telnet access and overriding the drive compatibility check during the DSM installation process.

Step-by-Step Instructions:

• Physically set up your NAS

  • Connect the NAS to your local network using Ethernet.

  • Ensure the device is powered on, even if no drives are installed or only unverified drives are present.

• Attempt initial DSM setup

  • Use Synology Assistant or go to http://find.synology.com to locate your NAS.

  • Proceed through the DSM installation wizard. You will likely encounter an error indicating that the inserted drive(s) are unsupported.

• Enable Telnet access

  • In a browser, navigate to:
    http://<NAS-IP>:5000/webman/start_telnet.cgi
    Replace <NAS-IP> with the actual IP address of your NAS.

• Connect via Telnet

  • Open a Telnet client like PuTTY.

  • Enter your NAS IP address and connect via Telnet.

  • When prompted, use:

    • Username: root

    • Password: 101-0101 (default for this Telnet interface)

• Bypass installation check

  • Enter the following command into the Telnet window:

    while true; do touch /tmp/installable_check_pass; sleep 1; done


  • This creates a temporary flag that bypasses the system’s compatibility verification loop.

• Return to the DSM install page

  • Refresh the browser window where you began the DSM setup.

  • DSM will now allow installation to proceed, even on unverified drives.

• Finish DSM setup

  • Complete the DSM installation.

  • Create your admin user account when prompted.

  • You can now access the full DSM interface.

Once DSM is installed, you can proceed to apply the permanent drive compatibility fixes, create storage pools, and remove warning banners—all covered in the next section.

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How to Allow Unverified HDDs or SSDs to Be Used for Storage Pools, Volumes, and Caching (and Remove Warnings)

Once DSM is installed, unverified drives will still be blocked from creating storage pools, volumes, or caches. Even if the system boots, Storage Manager will display warnings or greyed-out options. To unlock full functionality, you must apply a community-developed script that updates DSM’s internal drive compatibility database. This section outlines how to download, apply, and validate that change.

Step-by-Step Instructions:

• Enable SSH on your NAS
  • In DSM, go to Control Panel > Terminal & SNMP > Terminal.
  • Enable SSH service and click Apply.

• Prepare SSH access
  • Use PuTTY (or your preferred SSH client) to connect to your NAS.
  • Log in using your DSM administrator username and password (not root at this stage).
• Create working directory
  • Once connected, elevate to root:

    sudo -i
    

  • Create the required folder:

    mkdir -m775 /opt
    cd /opt
    

• Download the required scripts
  • Run the following commands to download the latest versions directly from Dave Russell’s GitHub:

    curl -O "https://raw.githubusercontent.com/007revad/Synology_HDD_db/refs/heads/main/syno_hdd_db.sh"
    curl -O "https://raw.githubusercontent.com/007revad/Synology_HDD_db/refs/heads/main/syno_hdd_vendor_ids.txt"
    chmod 750 /opt/syno_hdd_db.sh
    

• Run the script
  • Execute the script to patch the drive database:

    /opt/syno_hdd_db.sh
    

  • The script will detect your NAS model, DSM version, and connected drives. It will then add those drives to the compatibility database and back up the original files.

• Check Storage Manager
  • Return to DSM’s Storage Manager.
  • If changes are not immediately visible, reboot your NAS.
  • You should now be able to create storage pools, volumes, and SSD caches with unverified drives, without warning messages.
• Optional: Disable compatibility warnings completely
  • To stop future drive alerts from DSM, you may also want to run:

    /usr/syno/bin/synosetkeyvalue /etc.defaults/synoinfo.conf support_disk_compatibility no
    

At this point, all third-party drives currently installed in the system will be fully usable and recognized as supported. The next section explains how to add additional unverified drives later and have them automatically accepted.

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What to Do When Adding New HDDs or SSDs Later for Expansion, Replacement, or Hot Spares

After your initial setup and database modification, any newly added unverified drives will still appear as unsupported in DSM until they are explicitly added to the modified compatibility database. This section outlines how to safely introduce new drives for RAID expansion, hot spare assignment, or disk replacement without encountering blockages or warning messages.

Step-by-Step Instructions:

• Physically install the new drive(s)
  • Power down your NAS if required (for systems that don’t support hot-swapping).
  • Insert the new unverified HDDs or SSDs into available bays.
  • Power the NAS back on and log in to DSM.
• Check Storage Manager
  • Go to Storage Manager > HDD/SSD.
  • Newly added drives will appear but will be marked as “Not supported” or “Unverified.”
  • They will not be usable for volume expansion or as hot spares until added to the compatibility list.
• Reconnect via SSH
  • Use PuTTY or your SSH client to log into DSM with your admin credentials.
  • Elevate to root access:

    sudo -i
    

• Navigate to the working directory
  • Assuming you previously created /opt and stored the script there:

    cd /opt
    

• Run the update script again
  • This re-applies the database patch and includes newly inserted drives:

    ./syno_hdd_db.sh

1. Verify drive status
   • Go back to Storage Manager.
   • Refresh the page or reboot the NAS if needed.
   • The newly added drives should now appear as compatible and can be used for expansion, drive replacement, or assigned as hot spares.

This process can be repeated anytime new unverified drives are introduced. However, to avoid having to manually re-run the script every time, the next section covers how to set up a scheduled task that automates this during every system boot.

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How to Set Up a Scheduled Task to Re-Apply the Fix on Every Reboot

Synology DSM updates or certain system operations can overwrite or reset the internal compatibility database, especially after version upgrades or service restarts. To ensure that unverified drives remain recognized and fully functional even after a reboot, you can configure a scheduled task that automatically re-applies the compatibility script at every startup.

Step-by-Step Instructions:

• Log in to DSM and open Task Scheduler
  • Go to Control Panel > Task Scheduler.
  • Click Create > Triggered Task > User-defined script.
• Configure the general settings
  • Task Name: Name it something descriptive like Drive Compatibility Patch.
  • User: Select root from the dropdown (this is essential for full system access).
  • Event: Select Boot-up so the script runs every time the NAS starts.
  • Leave Enabled checked.

• Set the script action
  • Click on the Task Settings tab.
  • In the User-defined script box, enter the following command:

    mkdir -m775 /opt
    cd /opt || (echo "Failed to CD to /opt"; exit 1)
    curl -O "https://raw.githubusercontent.com/007revad/Synology_HDD_db/refs/heads/main/syno_hdd_db.sh"
    curl -O "https://raw.githubusercontent.com/007revad/Synology_HDD_db/refs/heads/main/syno_hdd_vendor_ids.txt"
    chmod 750 /opt/syno_hdd_db.sh
    /opt/syno_hdd_db.sh -e
    

  • This ensures the script is always downloaded fresh and applied with the -e flag for compatibility with scheduled tasks and email output (if enabled).
• Optional email notifications
  • Still under Task Settings, you can enable email alerts to be notified if the script fails or terminates abnormally.
• Save and test
  • Click OK to save the task.
  • You can manually run the task to confirm it executes correctly.
  • Reboot the NAS to ensure the script is applied at boot and unverified drives remain fully usable.

This scheduled task ensures long-term reliability and reduces the need for manual intervention whenever DSM is restarted, updated, or new drives are introduced.

---

Synology’s decision to restrict drive compatibility in its 2025 and later NAS models has complicated matters for users who prefer flexibility in their storage choices. However, through a combination of Telnet access, SSH scripting, and community-built tools like Dave Russell’s syno_hdd_db.sh, it is entirely possible to restore full drive functionality—even when using completely unverified SATA or NVMe devices. By following the steps outlined in this guide, users can install DSM on unverified drives, create storage pools, use SSDs for caching, and expand or modify their RAID configurations without limitations. Setting up an automated scheduled task further ensures these capabilities persist through reboots and DSM updates. While Synology may eventually broaden official support, this method provides a reliable and reversible way to maintain full control over your hardware today.

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Should You Buy the Synology DS925+ NAS?

In practical terms, the DS925+ is the stronger out-of-the-box choice, especially for users who value simplicity, improved default performance, and do not anticipate needing higher-than-2.5GbE networking down the line. However, the long-term value proposition becomes murkier when you factor in the DS923+’s PCIe expansion, broader drive compatibility, and the potential price drops that will follow its ageing status in Synology’s lineup. In short, the DS925+ is the better NAS on day one—more powerful, faster, and quieter. But if you’re planning for day 1,000, it’s worth pausing to consider whether the expandability and media flexibility of the DS923+ may be a better fit for your storage and networking needs over the next five to seven years.

Synology DS925+ NAS		Synology DS923+ NAS
Check Amazon in Your Region for the Synology DS925+ NAS	Check B&H for the Synology DS925+ NAS	Check Amazon in Your Region for the Synology DS923+ NAS	Check B&H for the Synology DS923+ NAS

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This description contains links to Amazon. These links will take you to some of the products mentioned in today's content. As an Amazon Associate, I earn from qualifying purchases. Visit the NASCompares Deal Finder to find the best place to buy this device in your region, based on Service, Support and Reputation - Just Search for your NAS Drive in the Box Below

Need Advice on Data Storage from an Expert?

Finally, for free advice about your setup, just leave a message in the comments below here at NASCompares.com and we will get back to you. Need Help? Where possible (and where appropriate) please provide as much information about your requirements, as then I can arrange the best answer and solution to your needs. Do not worry about your e-mail address being required, it will NOT be used in a mailing list and will NOT be used in any way other than to respond to your enquiry. [contact-form-7] TRY CHAT Terms and Conditions   Alternatively, why not ask me on the ASK NASCompares forum, by clicking the button below. This is a community hub that serves as a place that I can answer your question, chew the fat, share new release information and even get corrections posted. I will always get around to answering ALL queries, but as a one-man operation, I cannot promise speed! So by sharing your query in the ASK NASCompares section below, you can get a better range of solutions and suggestions, alongside my own.

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Synology Hard Drives and SSD Comparison with Seagate/WD/Toshiba and More – Deal Breaker?

In recent years, Synology has steadily moved toward a more vertically integrated hardware ecosystem, and the arrival of the 2025 generation of NAS systems marks a significant escalation in that approach. With a much stricter verification process for compatible storage media—covering both hard drives and SSDs—Synology now appears to heavily prioritize its own branded storage. This shift has sparked widespread debate across the NAS community, particularly as many long-time users of Seagate IronWolf, WD Red, and Toshiba NAS drives find themselves increasingly locked out of certain key features like RAID expansion, hot spare assignment, and recovery operations unless using “verified” drives. What’s more, while some of Synology’s media are rebranded and firmware-modified versions of familiar drives from Seagate and Toshiba, the pricing and compatibility limitations often leave users puzzled—and frustrated.

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Synology NAS and Media on Amazon – HERE Synology Products on B&H – HERE Seagate Ironwolf Media on Amazon – HERE WD Red Media on Amazon – HERE Seagate Products on B&H – HERE WD Products on B&H – HERE

In response to growing user concern, we conducted a comparison of Synology’s drive lineup against the current offerings from Seagate, WD, and Kingston—analyzing each in terms of price per terabyte, real-world performance, durability specifications, and availability. Drawing from direct benchmarking, manufacturer datasheets, and controlled NAS testing environments, this article aims to answer a key question: is Synology’s branded media actually worth the premium? While some users may welcome the simplicity of a one-brand ecosystem, others are understandably wary of higher costs, limited SKU availability, and the potential long-term implications of vendor lock-in. Let’s break down what Synology drives really offer—and where they fall short—compared to the tried and tested alternatives on the market.

Synology Hard Drives and SSDs – What Drives Are There to Buy?

Synology’s storage media catalog is divided across value, prosumer, enterprise SATA, and SAS hard drives, alongside both SATA and NVMe SSDs. While these drives carry the Synology name and firmware, they are not designed or manufactured in-house. Instead, Synology rebrands OEM hardware from established vendors: Toshiba for the enterprise SATA and SAS drives, Seagate for the value-tier NAS HDDs, and Phison-based platforms for SSDs. The internal firmware is customized by Synology to integrate tightly with DSM, and in some cases, to restrict compatibility to only their branded drives within the latest 2025 NAS systems.

The naming scheme makes it easier to distinguish between drive classes:

• HAT for SATA NAS hard drives

• HAS for SAS enterprise drives

• SAT for SATA SSDs

• SNV for NVMe SSDs

This segmentation aims to help users align their hardware with expected durability (e.g. workload in TB/year), power loss protection, and RAID integration. However, it’s worth noting that several of these drives are virtually identical to third-party counterparts—particularly in the HAT3300 and HAT3310 lines, which closely mirror Seagate IronWolf models down to mechanical structure and spec. Despite this, third-party versions of those drives remain incompatible with key RAID features on the latest Synology systems unless they are officially “verified.”

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Synology NAS HDDs – HAT Series (SATA)

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Synology SAS HDDs – HAS Series

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Synology SATA SSDs – SAT Series

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Synology NVMe SSDs – SNV Series

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While Synology’s branding suggests ecosystem cohesion, it’s essential to recognize that their drive firmware is not engineered for general-purpose systems. These drives are optimized—and in some cases restricted—for Synology NAS environments. However, performance benchmarks show that Synology drives often perform equivalently or slightly below their third-party counterparts in synthetic and real-world tests. Moreover, price comparisons reveal a 5–15% markup on average in the value tier, and significantly higher deltas—often exceeding 30–40%—in the enterprise-class and SSD segments. Combined with regional supply inconsistencies and limited SKU availability, the value proposition of Synology-branded drives remains hotly debated, especially when identical hardware from Seagate or Toshiba can be purchased for less—if only the 2025 NAS series would support them natively.

Synology Hard Drives and SSDs vs Seagate, WD, etc – Price per TB and Value

When it comes to entry-level NAS hard drives, the price differences between Synology’s HAT3300 and HAT3310 series and their third-party equivalents—such as Seagate IronWolf and WD Red Plus—are generally modest. In most cases, the cost per terabyte (TB) stays within a 0% to 15% margin, with Synology’s versions sitting slightly higher. For casual or home users who just want a drive that “just works” out of the box and benefits from firmware-level integration with DSM, that small premium might feel justifiable.

But the story changes dramatically as we move into prosumer and enterprise territory. Drives like the Synology HAT5300 and HAS5300 series can cost 40%–50% more than Seagate IronWolf Pro, WD Red Pro, or Seagate Exos alternatives—despite sharing the same mechanical internals in many cases. These aren’t just marginal differences; when you’re building a multi-drive RAID array with 12TB or 16TB drives, that pricing gap quickly snowballs into hundreds or even thousands of dollars extra. And this is particularly frustrating when, for example, Synology’s 12TB HAT5300 (built on Toshiba hardware) costs nearly double what a comparable IronWolf Pro sells for, despite similar endurance ratings and warranty terms.

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Entry-Level NAS HDDs – Synology vs Seagate & WD

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Prosumer NAS HDDs – Synology vs Seagate & WD

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Enterprise SAS HDDs – Synology vs Seagate Exos

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Enterprise SATA SSDs – Synology vs Kingston

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NVMe SSDs – Synology vs WD Red SN700

In short, while Synology’s drives are built on reputable platforms and do offer advantages like verified DSM integration and predictable firmware behavior, the value proposition becomes questionable—especially in higher capacities and enterprise deployments. For many users, especially SMBs and home power users deploying multi-drive setups, that extra 40–50% markup can be hard to justify. When the mechanical hardware is near-identical and the only major differentiator is firmware control, it’s no wonder many are pushing back against this pricing structure.)

SYNOLOGY DSM Storage Manager Benchmarks (1st and 3rd Party Drive Media)

Zoom in to see the results. IMPORTANT that you keep in mind that these SSDs and HDDs are different capacities and therefore direct comparison and correlation between their performance is not fair – I include these because I think it is important to compare the general gist of using Synology HDD media in a system and then alternatives, but measured with Synology’s in-system tools. Larger capacities mostly tend to yeald better results in any brand of drive (not a ‘do-or-die’ rule, but generally true).

SYNOLOGY HAT3300 HDD	Seagate Ironwolf HDD
SYNOLOGY HAT5300 HDD	Seagate EXOS HDD
SYNOLOGY SAT5200 SSD	Kingston DC600 SATA SSD
SYNOLOGY M.2 NVMe SSD	TeamGroup T-Create Gen3 M.2 SSD

Synology Hard Drives and SSDs vs Seagate, WD, etc – Performance

IMPORTANT – In the process of upscaling the test result images (as there is a lot crammed in, so I have included the slightly blurred ones here) but I and will replace these with upscaled versions as soon as possible.

When it comes to performance, Synology’s hard drives and SSDs generally stay within expected ranges for their class—but with some caveats. Most of their HDDs mirror the performance of the OEM drives they’re based on, particularly in the HAT3300 and HAT3310 lines, which perform nearly identically to WD Red Plus and Seagate IronWolf models. You’re looking at familiar specs here: 5400–7200 RPM spin speeds, ~200–280MB/s sequential transfer rates, and ~180TB/yr workload ratings. That’s no surprise, considering these are essentially Seagate or Toshiba drives with Synology firmware and branding. Where things start to scale up, like in the HAT5300 and HAS5300 series, the specs remain on par with their higher-end third-party equivalents. These drives offer 550TB/year workloads, 7200 RPM motors, and MTBF figures around 2.5 million hours—just like IronWolf Pro, WD Red Pro, or Seagate Exos. But Synology currently tops out at 20TB in both SATA and SAS drives, while the competition is already pushing 22TB, 24TB, and even 26TB models. So, if you’re planning a high-capacity build, Synology might already be limiting your options on sheer scale alone.

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NAS HDDs – Capacity, Performance, Endurance & Class Comparison

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Performance parity continues with Synology’s SATA SSDs. The SAT5221 and SAT5210 series are very close in spec to Kingston’s DC600M drives, offering similar read/write speeds, IOPS performance, and endurance levels. The SAT5210 even pushes into ultra-DWPD territory, boasting up to 10,000 TBW and higher daily write thresholds, which is competitive in the enterprise space. If you need high write endurance and steady power loss protection, these drives tick the right boxes.

The gap, however, opens up in the NVMe tier. Synology’s SNV3400 and SNV3500 drives fall short compared to third-party NVMe SSDs like the WD Red SN700. While Synology focuses on endurance, PLP (power loss protection), and integration with DSM caching features, the performance ceiling on these drives is noticeably lower—both in terms of sequential throughput and IOPS. Capacities also top out at 800GB, while others offer 1TB and beyond with faster read/write performance. So if you’re after speed or larger NVMe caching pools, Synology’s current options may feel behind the curve.

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SATA & NVMe SSDs – Synology vs Kingston

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In short, Synology’s drives generally deliver solid, reliable performance that matches their third-party foundations—but the benefits of full DSM compatibility come with a trade-off. While the SATA range holds its ground, the NVMe lineup is due for an update if Synology wants to stay competitive against higher-capacity, higher-speed SSDs now widely available elsewhere. If performance is your main concern, particularly for NVMe caching or flash-heavy tasks, third-party options may be a better fit unless full integration is a must-have.

Synology Hard Drives and SSDs Guide – The Good and the Bad

In reviewing Synology’s lineup of hard drives and SSDs, it’s clear that the hardware itself is solid—built on trusted OEM foundations and tuned to work seamlessly within DSM environments. From a compatibility and reliability standpoint, these drives do offer advantages, particularly for users who want an integrated, no-hassle deployment. That said, these benefits come with notable trade-offs. In many cases, Synology’s drives are mechanically identical to models from Seagate, Toshiba, or Phison, yet priced significantly higher—especially in the enterprise and NVMe tiers. While some of that premium may be justified by firmware-level integration, PLP, or simplified support paths, the cost disparity is hard to ignore for experienced users already comfortable with third-party hardware.

Ultimately, the decision to adopt Synology-branded drives will depend on your priorities. If you’re building a system where out-of-the-box compatibility, long-term support, and unified ecosystem control are paramount, Synology’s media may be a safe bet—albeit at a higher packaged price. But if your focus is on maximizing performance per dollar, scaling capacity, or customizing your setup beyond Synology’s verified list, third-party alternatives remain the more flexible and cost-effective choice. Until Synology expands their verified media list and adjusts regional pricing or availability, many users will continue to see these drives not as a value-add, but as an imposed requirement.

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What Are Synology NAS Product Refreshes and What is Synology’s Logic?

When Synology introduces a new wave of NAS devices, it’s easy to assume that each new model is a significant leap forward. However, many of these launches are better classified as product refreshes, not entirely new product lines. This distinction matters. A refresh typically reuses a core hardware platform—such as the chassis, CPU, or layout—but includes modest updates like better network interfaces, more memory, or small component shifts. In 2025, Synology rolled out one of its broadest refresh cycles in years, affecting models across their two-bay, four-bay, five-bay, and eight-bay portfolios. Understanding what a refresh actually is helps users make more informed decisions, especially when evaluating whether to upgrade or wait.

Synology refreshes its products for a few practical reasons. First, component availability and pricing change over time. CPUs and other hardware elements that were once expensive or reserved for high-tier models often become more affordable, making them suitable for use in lower-tier devices. For example, the AMD V1500B processor, once exclusive to mid-tier and enterprise NAS systems, has trickled down into several 2025 refreshes like the DS925+ and DS1525+. Similarly, market-wide transitions—such as the shift from 1GbE to 2.5GbE—are reflected in these updates, allowing Synology to modernize existing models while keeping their manufacturing costs and prices relatively stable.

One of the key things that sets a refresh apart from a brand-new NAS model is Synology’s commitment to product tier consistency. Devices like the DS725+, DS425+, or DS1825+ aren’t being built to reinvent the wheel. Instead, they exist to preserve the price-to-performance balance that their predecessors established in the Synology product lineup. By holding onto the same CPU, expanding RAM slightly, and upgrading network ports from 1GbE to 2.5GbE, Synology keeps these NAS solutions within their traditional target audience—be it home users, prosumers, or small businesses. The physical design and key feature sets are familiar, and that’s deliberate. Refreshes aim to improve what already works, not redefine the category.

It’s also worth recognizing that Synology’s product refreshes are not aimed at recent buyers. If you just picked up a DS723+ or DS923+ last year, you are not the intended audience for the DS725+ or DS925+. Instead, these refreshes are aimed at users still running a DS216+, DS416, or DS1813+—users who are five to ten years deep into their existing systems. For them, the new hardware represents a meaningful leap forward, even if it looks modest on paper. When you compare a DS916+ to a DS925+, the differences in memory, CPU threads, M.2 caching, and DSM features become much more pronounced.

Pricing also plays a central role in Synology’s refresh strategy. For the most part, Synology tries to keep prices stable across generations, despite inflation and rising manufacturing costs. For example, the DS425+ and DS225+ refreshes, though modest in their hardware upgrades (mainly 2.5GbE LAN replacing 1GbE), still aim to hit the same price points as their DS423+ and DS224+ predecessors. This can make refreshes seem less appealing to new buyers comparing specs on a chart, but it serves long-term users who value Synology’s software ecosystem, consistent performance, and extended support.

One notable outlier in Synology’s refresh strategy is the continued use of the Intel Celeron J4125 processor, particularly in models like the DS425+, DS225+, and DS625slim. Despite Synology’s tendency to update hardware every 2–3 years based on market trends and component availability, the J4125—originally launched in 2019—feels increasingly outdated in 2025. Intel itself has moved away from the Celeron/J-series naming convention entirely, transitioning to more efficient and capable platforms like Alder Lake-N and N-series processors. This shift highlights just how long in the tooth the J4125 has become. With no support for newer instruction sets, lower efficiency compared to modern equivalents, and limited future compatibility, its continued presence in refreshed Synology NAS models stands in stark contrast to the broader trend of hardware advancement. While Synology has prioritized price consistency and DSM support, the persistence of this older CPU dampens the appeal of these refreshes for new buyers who expect more current internals at a similar price point.

Another important factor is Synology’s software-first development model. Their NAS hardware isn’t meant to push technical limits but rather serve as a stable, reliable platform for DSM (DiskStation Manager). That’s why even in refreshes, the focus is on compatibility and long-term support over flashy specs. Synology has made this clear through product cycles like the DS1825+, which retains the same CPU as the DS1821+ but gains 2.5GbE and better memory configuration—supporting the increasing demands of DSM applications without needing an overhaul of the entire system.

In summary, a product refresh in Synology’s ecosystem is not a groundbreaking redesign, but a thoughtful, incremental update within an established product profile. These refreshes ensure the long-term viability of key NAS tiers while adapting to evolving market standards like 2.5GbE, more demanding software workloads, or new expansion options. For long-time users, they offer an accessible upgrade path. For newcomers, they may seem underwhelming on paper. But in either case, they represent a balancing act between hardware, price, and software synergy, which has long been Synology’s model—whether you agree with it or not.

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Synology DS1825+ vs DS1821+ NAS Comparison – Get It Right, FIRST TIME!

When Synology releases a new NAS in its “Plus” lineup, users often expect a blend of practical improvements, long-term support, and a reasonable upgrade path from the previous generation. The Synology DS1825+ arrives in 2025 as the official successor to the 2020/2021-released DS1821+, carrying over much of the same core design while introducing selective enhancements—and a few contentious changes. Both are 8-bay desktop NAS systems targeted at advanced home users, small businesses, and content creators who need multi-user access, flexible RAID configurations, and extensive app support. However, while the DS1821+ was praised for its broad compatibility and modular connectivity, the DS1825+ adopts a more tightly controlled hardware ecosystem. In this comparison, we break down the key differences across hardware, ports, storage capabilities, DSM software features, and drive compatibility so you can decide which model truly fits your long-term needs—without second-guessing your choice later.

Synology DS1825+ vs DS1821+ NAS Comparison – Internal Hardware

At the center of both the Synology DS1821+ and DS1825+ is the AMD Ryzen V1500B processor, a 4-core, 8-thread embedded SoC with a 64-bit architecture and a base frequency of 2.2 GHz. This chip, built on the Zen architecture, offers a balance of power efficiency and multi-threaded performance suited for environments with simultaneous multi-user file access, virtual machines, and complex RAID configurations. Synology’s decision to retain the same processor in the DS1825+ reflects confidence in its reliability and capability. However, for users hoping for a jump to Zen 2 or Zen 3-based hardware, the lack of a CPU upgrade could be a disappointment—especially considering that competing vendors have started adopting newer architectures for their mid-range systems. Still, for typical NAS tasks that do not involve on-the-fly 4K video transcoding or GPU-heavy operations, the V1500B remains a stable and effective platform with AES-NI encryption support and virtualization compatibility across VMware, Hyper-V, and Docker workloads.

Thermal and power characteristics between the two systems remain largely consistent, with both featuring dual 120mm fans and an internal 250W PSU that can handle full drive loads with expansion units attached. The DS1821+ and DS1825+ are also nearly identical in physical size and structure, though the newer model has a slightly higher idle noise level—23.8 dB(A) versus 22.2 dB(A)—due to denser internal configuration and possibly fan speed curve adjustments. From an operational standpoint, the DS1825+ is marginally more power-efficient in idle states, consuming just 18.34W during HDD hibernation compared to 26.18W in the DS1821+. These marginal differences suggest a refinement in system tuning, although not a radical redesign. Overall, while the DS1825+ doesn’t revolutionize internal hardware, its doubled memory and subtle optimizations give it the edge for users planning to push DSM with multiple services or those who prefer an upgrade-free deployment experience.

Synology DS1825+ vs DS1821+ NAS Comparison – Ports and Connections

One of the most tangible areas of differentiation between the DS1821+ and DS1825+ lies in their external connectivity. The older DS1821+ is equipped with four 1GbE RJ-45 LAN ports, a familiar configuration that supports link aggregation and network redundancy. This setup was common in Synology’s mid-range lineup during its 2020–2022 releases, offering a total aggregated bandwidth of up to 4Gbps—assuming your switch infrastructure supports it. For many small business users, this array of ports provided simple flexibility: you could dedicate individual ports for different services or bond them for faster file transfers. However, in practice, 1GbE is increasingly becoming a limiting factor for modern workloads, especially in environments with large raw video files, database access, or multiple users performing high-speed backups.

Beyond networking, the DS1825+ introduces a notable change in expansion port design. The DS1821+ includes two eSATA ports for attaching Synology DX517 expansion units, which align with legacy expansion practices. In contrast, the DS1825+ replaces these with two USB-C-based expansion ports, designed specifically for use with the newer DX525 expansion units. While this doesn’t directly affect day-to-day operations, it signals a move toward a USB-based proprietary interface for future expansion, likely with more streamlined cabling and higher throughput potential. Additionally, the DS1825+ trims down from four USB 3.2 Gen 1 ports to three, a minor trade-off that may impact users with multiple USB-connected devices such as UPS units or backup drives. Still, for most users, the improved network and expansion standards make the DS1825+ more forward-looking, even if it reduces legacy connectivity options found on the DS1821+.

Synology DS1825+ vs DS1821+ NAS Comparison – Storage

Both the DS1821+ and DS1825+ offer eight front-facing SATA drive bays, supporting 3.5″ HDDs and 2.5″ SSDs, with hot-swappable trays for easy maintenance and upgrades. On the surface, storage capacity and configuration appear nearly identical: both models can scale up to 18 total drives using two Synology expansion units and support RAID levels including SHR, RAID 5, 6, and 10. This makes either system a viable choice for users with large datasets, whether for media, surveillance, or business-critical file hosting. However, subtle distinctions in how storage can be configured and expanded in each model make a significant difference over time.

This tightening of compatibility extends into pool expansion, RAID rebuilds, and even hot spare assignments. In the DS1821+, users could freely mix third-party drives and expand pools over time using available or similarly specced HDDs—even those not on the official compatibility list. The DS1825+ takes a stricter approach: attempts to initialize DSM with unverified HDDs will fail, and pool expansion or RAID recovery with unsupported drives is outright blocked. While existing volumes from older NAS systems can still be migrated and booted, they will trigger persistent compatibility warnings in DSM, often with degraded system health indicators. This shift may offer Synology more control over performance validation and support consistency, but it limits flexibility for users relying on diverse or existing storage media—making the DS1821+ a better option for those with a mix-and-match approach, and the DS1825+ more suitable for fully standardized Synology deployments.

Synology DS1825+ vs DS1821+ NAS Comparison – DSM Capabilities

Both the DS1821+ and DS1825+ are powered by Synology’s DiskStation Manager (DSM) 7.2 operating system, offering access to a rich suite of applications for file management, backup, surveillance, virtualization, and cloud syncing. Core tools such as Synology Drive and Synology Photos provide a private cloud alternative to services like Google Drive or Dropbox, while packages like Hyper Backup and Active Backup for Business enable full-system and client-based data protection strategies. These services run similarly on both systems, but hardware differences can influence practical performance. For example, the DS1825+ ships with 8 GB of ECC memory by default, making it more responsive when running multiple DSM apps in parallel—such as Snapshot Replication combined with Virtual Machine Manager and Drive Client Sync. In contrast, the DS1821+ ships with 4 GB of memory, which may require an upgrade before achieving similar multitasking fluidity, especially in environments with more than a few simultaneous users.

Service limits within DSM also subtly differentiate the two models. The DS1821+ is rated for up to 110 concurrent users in Synology Drive and Office, whereas the DS1825+ recommends a slightly lower threshold of 100 users. While the difference is marginal, it may reflect the DS1825+’s tighter memory tuning or more restrictive compatibility model, which now relies on verified Synology storage media for optimal performance. For example, in environments running Synology Office with real-time collaborative editing—paired with Drive, MailPlus, and external file sharing through WebDAV—the DS1821+ might offer more flexibility when loaded with third-party high-performance SSDs for caching. The DS1825+, restricted to Synology’s own SNV3400/3410 NVMe drives, demands tighter ecosystem compliance, which could affect responsiveness if storage performance becomes a bottleneck. Nonetheless, both models offer full support for advanced DSM modules like Synology High Availability, SAN Manager, and Hybrid Share, ensuring that users deploying in mission-critical environments still have access to the high-availability and hybrid cloud features that define Synology’s enterprise-ready platform.

Although DSM 7.2 offers the same interface and core functionality across both the DS1821+ and DS1825+, the user experience diverges notably during storage migration, particularly when using older or unverified hard drives. Users migrating existing volumes from earlier Synology systems—such as the DS918+, DS1819+, or DS920+—will find that the DS1821+ accepts those drives with minimal friction. DSM will boot normally, recognize the existing array, and issue only minor warnings in Storage Manager regarding drive verification, which are generally dismissible and do not affect functionality. RAID recovery, pool expansion, and the addition of hot spare drives all remain fully accessible, even when using third-party or previously unsupported drives. In contrast, the DS1825+ enforces stricter hardware validation: while it will mount migrated volumes, the system interface becomes saturated with persistent warning banners, amber and red health statuses, and limited drive information if the drives are not officially verified. These warnings cannot be dismissed, and attempts to rebuild RAID, add new drives to existing pools, or assign hot spares using unverified media will be blocked entirely. As a result, while both systems technically support migration, the DS1821+ offers a far more tolerant and practical transition path for users with legacy or mixed-brand storage configuration.

Synology DS1825+ vs DS1821+ NAS Comparison – Conclusion

Choosing between the Synology DS1825+ and DS1821+ comes down to whether you prioritize modern hardware refinements or broader long-term flexibility. The DS1825+ introduces subtle but meaningful upgrades: faster 2.5GbE connectivity, double the base memory, and NVMe storage pool support—features that clearly position it as the more forward-thinking choice for users committed to staying within the Synology ecosystem. However, these improvements come with tighter restrictions, most notably in its rigid drive compatibility policy. DSM cannot be installed unless only Synology-verified drives are used, and the system actively blocks unverified drives from being used in storage pools, RAID rebuilds, or even hot spare configurations. In contrast, the DS1821+ offers more freedom—supporting a wider range of HDDs and SSDs, allowing RAID recovery and expansion with non-Synology drives, and presenting a cleaner, less obstructive DSM experience when migrating from older hardware. While it may lack the newer model’s out-of-the-box performance gains, its open-ended architecture gives users—especially those with legacy drives or mixed environments—more breathing room. For users building a NAS from scratch and willing to adopt Synology’s closed hardware ecosystem, the DS1825+ is a capable and streamlined solution. But for those looking to extend the life of existing hardware or retain control over their storage media choices, the DS1821+ remains the more versatile and user-friendly option.

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Need Advice on Data Storage from an Expert?

Finally, for free advice about your setup, just leave a message in the comments below here at NASCompares.com and we will get back to you. Need Help? Where possible (and where appropriate) please provide as much information about your requirements, as then I can arrange the best answer and solution to your needs. Do not worry about your e-mail address being required, it will NOT be used in a mailing list and will NOT be used in any way other than to respond to your enquiry. [contact-form-7] TRY CHAT Terms and Conditions   Alternatively, why not ask me on the ASK NASCompares forum, by clicking the button below. This is a community hub that serves as a place that I can answer your question, chew the fat, share new release information and even get corrections posted. I will always get around to answering ALL queries, but as a one-man operation, I cannot promise speed! So by sharing your query in the ASK NASCompares section below, you can get a better range of solutions and suggestions, alongside my own.

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Synology DS1525+ vs DS1522+ NAS Comparison – Get It Right, FIRST TIME!

With the arrival of the Synology DS1525+ in 2025, many users are now weighing it against its immediate predecessor, the DS1522+, released in 2022. On the surface, both NAS units share the same 5-bay form factor, nearly identical chassis design, and very similar price points—typically between $699 and $799 at launch. However, a deeper dive reveals a number of meaningful changes in hardware resources, storage expansion policies, and how Synology now handles drive compatibility and system flexibility. While the DS1525+ does offer better networking and CPU core count, it also introduces tighter restrictions on what drives can be used, how storage pools are formed, and what options are available to users looking to migrate data from older systems. By contrast, the DS1522+ retains a far more open approach to hardware, offering greater freedom for enthusiasts and IT professionals. In this article, we’ll break down the internal hardware, ports, storage support, DSM software capabilities, and system behavior of these two NAS systems—giving you the context you need to make the right decision the first time, and avoid buyer’s regret later.

Synology DS1525+ vs DS1522+ NAS Comparison – Internal Hardware

The most noticeable hardware difference between the DS1525+ and DS1522+ lies in their processors. The DS1522+ is powered by a dual-core AMD Ryzen R1600 CPU, which operates at a base frequency of 2.6 GHz and can boost up to 3.1 GHz. This chip delivers strong single-threaded performance and is very power efficient, making it well-suited for environments where tasks are sequential or lightly parallelized—such as SMB file sharing, surveillance, or general-purpose storage. The DS1525+, in contrast, uses a quad-core AMD Ryzen V1500B processor running at a fixed 2.2 GHz. While it lacks boost frequency, the additional cores and threads make it the more capable option for multitasking-intensive DSM deployments. Workloads like hosting multiple Docker containers, running several VMs, or operating high-volume backup jobs are handled more smoothly by the V1500B thanks to its stronger concurrent throughput. While synthetic benchmarks might show the R1600 ahead in single-threaded operations, in day-to-day NAS usage, the V1500B’s multitasking benefits are more relevant—particularly for users aiming to centralize many services on one box.

Synology DS1525+ vs DS1522+ NAS Comparison – Ports and Connections

The differences between the DS1525+ and DS1522+ become more apparent when examining their networking and expansion connectivity. The DS1522+ is equipped with four 1GbE RJ-45 LAN ports, which support link aggregation for up to 4 Gbps combined bandwidth when used with a managed switch. This configuration provides solid redundancy and flexible port allocation, especially for environments where isolating traffic across different services (e.g., backups, media, surveillance) is desirable. However, in 2024 and beyond, 1GbE is increasingly viewed as a bottleneck—particularly for users working with 4K video editing, large VM images, or fast local backups. The DS1525+ addresses this issue by shifting to 2 × 2.5GbE RJ-45 LAN ports, allowing up to 5 Gbps total bandwidth through link aggregation, and faster speeds on a per-connection basis, even when using unmanaged 2.5GbE switches that are now more common and affordable. This change aligns the DS1525+ with modern mid-tier NAS expectations and offers improved real-world performance, especially for multi-user workloads and high-speed transfers from SSD caches or NVMe pools.

Additionally, both units include a PCIe Gen3 x2 slot for optional 10GbE network upgrades. Synology’s E10G22-T1-Mini card is supported on both models and provides a compact, cost-effective way to future-proof network performance. However, given the DS1525+ already starts with 2.5GbE, users may find less urgency to upgrade immediately compared to the DS1522+, where a 10GbE card may be needed sooner to break past 1GbE limitations. Both models support Wake-on-LAN and scheduled power events, and both feature dual rear fans for effective cooling regardless of network traffic or drive load. From a connectivity standpoint, the DS1525+ represents a forward step toward higher-speed networking and modern expansion methods—but it does so at the cost of legacy compatibility, which may matter for users with established infrastructure. In contrast, the DS1522+ offers broader port coverage and flexibility but risks becoming dated more quickly in high-throughput environments.

Synology DS1525+ vs DS1522+ NAS Comparison – Storage

At first glance, storage capacity and physical layout appear virtually identical between the DS1525+ and DS1522+. Both systems offer five main drive bays that support 3.5″ SATA HDDs and 2.5″ SATA SSDs, as well as two M.2 NVMe SSD slots for caching or, in the case of the DS1525+, full storage pool creation. Each NAS can be expanded up to a total of 15 bays using two proprietary Synology expansion units (DX517 for the DS1522+, DX525 for the DS1525+), enabling up to 240 TB of raw storage assuming maximum capacity drives. However, a major divergence emerges when we examine drive compatibility policies. The DS1522+ follows Synology’s older, more permissive approach: users may install third-party drives from brands like Seagate, Western Digital, or Toshiba with only warning messages shown during setup. Storage pools, RAID arrays, and DSM installation all proceed without functional restrictions, making it a flexible platform for users with existing drives or cost-sensitive deployments.

Both the DS1525+ and DS1522+ run Synology’s DSM 7.2 operating system and provide access to the same broad library of official and third-party packages. This includes core applications such as Synology Drive for file sync and access, Synology Office for collaborative documents, and Active Backup for Business for system-wide backup management. The app experience is largely identical on both devices, with support for Virtual Machine Manager, Hyper Backup, Snapshot Replication, Synology Photos, and Surveillance Station. However, the differences in system hardware and compatibility enforcement subtly influence how DSM behaves and what features remain available under different configurations. For example, both models support up to 256 snapshots per shared folder and a system-wide maximum of 4,096 snapshots, but users on the DS1525+ will be subject to stricter compatibility enforcement in DSM’s Storage Manager if using drives that aren’t on Synology’s approved list.

Synology DS1525+ vs DS1522+ NAS Comparison – Conclusion

The Synology DS1525+ and DS1522+ may look nearly identical on the outside, but they diverge sharply in philosophy, system behavior, and long-term value. The DS1522+, launched in 2022, stands as one of the last truly flexible 5-bay NAS systems in Synology’s portfolio. It offers a dual-core AMD Ryzen R1600 processor with excellent single-thread performance and supports up to 15 drives with two DX517 expansions. More importantly, it retains the traditional Synology approach to third-party drive compatibility—meaning users can install and operate a wide range of HDDs and SSDs (Seagate, WD, Toshiba, etc.) without system blocks. DSM will issue warnings if a drive isn’t officially listed, but critical features like RAID recovery, storage pool expansion, and hot spare assignment continue to function. That level of hardware openness makes the DS1522+ particularly attractive to power users, budget-conscious builders, and small IT teams looking to repurpose existing hardware. The DS1525+, released in 2025, represents a subtle but significant shift in Synology’s design strategy. On paper, it offers solid upgrades: a quad-core AMD Ryzen V1500B processor that enables better multitasking, faster 2.5GbE LAN ports for improved data throughput, lower noise and power consumption, and full NVMe storage pool support (with Synology SSDs). These improvements make the DS1525+ a better fit for users running multiple simultaneous services—such as Surveillance Station, Synology Drive, and Docker containers—all while maintaining smooth operation. However, these benefits come with stricter limitations. The unit enforces Synology’s 2025-era drive verification policy, which outright blocks DSM installation or RAID operations with unverified drives. Migration is allowed, but users will be met with persistent warnings, degraded system status indicators, and feature restrictions that can’t be bypassed. The flexibility to reuse older drives, expand arrays freely, or mix hardware brands has been systematically curtailed.

In essence, the choice between these two NAS systems reflects more than just performance—it’s a decision between openness and control. The DS1522+ remains a strong all-rounder for users who want to build their system on their own terms, manage diverse storage needs, or repurpose hardware they already trust. It’s well-suited to small businesses, creators, and experienced users who value transparency and adaptability. The DS1525+, by comparison, is more refined, but also more prescriptive. It favors users willing to commit fully to Synology’s ecosystem—those who prioritize simplicity, tighter integration, and long-term consistency, even at the expense of flexibility. It’s a better fit for turnkey environments where reliability and vendor support matter more than customization. Both NAS devices are excellent in their own right, but the right choice depends entirely on how much control you’re willing to trade for convenience—and whether your NAS should be a platform you shape, or a solution that shapes your workflow.

 

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Finally, for free advice about your setup, just leave a message in the comments below here at NASCompares.com and we will get back to you. Need Help? Where possible (and where appropriate) please provide as much information about your requirements, as then I can arrange the best answer and solution to your needs. Do not worry about your e-mail address being required, it will NOT be used in a mailing list and will NOT be used in any way other than to respond to your enquiry. [contact-form-7] TRY CHAT Terms and Conditions   Alternatively, why not ask me on the ASK NASCompares forum, by clicking the button below. This is a community hub that serves as a place that I can answer your question, chew the fat, share new release information and even get corrections posted. I will always get around to answering ALL queries, but as a one-man operation, I cannot promise speed! So by sharing your query in the ASK NASCompares section below, you can get a better range of solutions and suggestions, alongside my own.

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