Synology 2025 NAS Series 3rd Party Drive Compatibility Tests

UPDATED 07-05-25 = Added Unverified HDD and SSD (Migrated) Storage Pool RAID Repair, RAID POOL Expansion and Hot Spare Tests. Right now, the following is what works and what does not (between pre-2025 Series and the 2025 Series that is releasing now):

Feature / Function	Pre-2025 Synology NAS<br>(e.g., DS1821+, DS920+, DS923+)	2025 Synology NAS<br>(e.g., DS1825+, DS925+, DS1525+)
DSM Installation – Verified Drives	Full support	Full support
DSM Installation – Non-Verified Drives	Allowed (with warnings)	Blocked completely
Drive Migration (Non-Verified Drives)	Fully functional, minor alerts	Works, but shows persistent warnings
Storage Pool Creation – Verified Drives	Fully supported	Fully supported
Storage Pool Creation – Non-Verified Drives	Allowed (with warnings)	Blocked
Storage Pool Expansion – Verified Drives	Fully supported	Fully supported
Storage Pool Expansion – Non-Verified Drives	Allowed (mixed arrays supported)	Blocked – drives flagged as incompatible
Hot Spare Assignment – Verified Drives	Fully supported	Fully supported
Hot Spare Assignment – Non-Verified Drives	Allowed	Blocked
RAID Recovery – Verified Drives	Supported	Supported
RAID Recovery – Non-Verified Drives	Supported	Blocked – system will not rebuild with unverified media
M.2 NVMe Cache – Synology SSDs	Supported	Supported
M.2 NVMe Cache – 3rd Party SSDs	Supported	Blocked
M.2 NVMe Storage Pools – Synology SSDs	Not supported	Supported
M.2 NVMe Storage Pools – 3rd Party SSDs	Not supported	Blocked
SMART Monitoring – Verified Drives	Full support	Full support
SMART Monitoring – Non-Verified Drives	Full support	Limited or blocked (TBC)
Storage Manager Alerts – Non-Verified Drives	Warnings, dismissible	Persistent, cannot be cleared
Overall Compatibility Flexibility	High – mix-and-match drives allowed	Low – walled-garden enforcement

Here’s what we’ve confirmed so far in the tests as of 07/05/25:

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Using Synology 1st Party Drives – Everything Works as Expected

If you’re using Synology-branded HDDs or SSDs, then your experience on the DS925+ will be completely normal.

System initialization, DSM installation, storage pool creation, and all other operations work exactly as they always have, with no warnings, compatibility errors, or feature restrictions. This includes both the Plus series (e.g., HAT3300/HAT3310) and the Enterprise-class HAT5300 drives.

These drives are the only ones currently listed as fully supported on the official compatibility list for the DS925+, and this exclusive support ensures full DSM integration, performance monitoring, and system health reporting. If you’re a first-time buyer who’s starting from scratch, and you’re willing to buy fully into the Synology ecosystem, this route remains the most seamless — albeit more expensive — option.

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New Installations Blocked for Non-Verified Drives

As discussed in our NASCompares coverage and testing videos, attempting to initialise the DS925+ with hard drives that are not on the 2025 series compatibility list will block you from even starting DSM installation.

Below is the Synology DS925+ HDD Compatibility as of 3rd May 2025

This marks a major departure from Synology’s previous approach in DSM 7.0 and 7.1, where unsupported drives could still be used — though users would receive warnings in Storage Manager.

Below is the Synology DS923+ HDD Compatibility for comparison

Now, if you’re using unverified HDDs (such as Seagate IronWolf or WD Red Plus), the DS925+ will not proceed past the initial setup.

You’ll receive a message informing you that the drive is not compatible, and DSM cannot be installed. There’s no bypass, workaround, or “install anyway” option — and this applies even if the drives are physically identical to previously approved models.

This new and more limited approach (at least at the time of writing) raises concerns for home and business users alike who have previously relied on mixing and matching their preferred HDD brands with Synology hardware.

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Drive Migration from Older Synology NAS – It Works, But Comes with Warnings

If you already own a Synology NAS and are planning to migrate your storage pool from an older system to the DS925+, you’ll be able to do so — even if your drives are no longer listed as compatible on the newer system.

DSM will recognize the array, import the configuration, and boot the system using your original DSM setup.

However, the entire system will then display a persistent series of warnings and error states, including amber and red icons in Storage Manager, drive health indicators marked “At Risk,” and compatibility warnings across the interface.

While everything technically works, the interface becomes visually and functionally “noisy.” For system integrators or IT administrators, this is especially important — your clients may perceive something is seriously wrong with the NAS even when the system is healthy.

It’s recommended to proactively inform any end users or clients about these warnings post-migration, to avoid unnecessary concern or support tickets. Synology has not yet provided a method to suppress or acknowledge these warnings permanently.

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SATA SSDs Seem to Bypass the Block – But Still Carry Warnings

One of the more surprising findings in our testing was that SATA SSDs, even when not listed on the official compatibility list, were still able to initialize the DS925+ and allow DSM to be installed.

We tested this with several models, and the installation process continued normally — a stark contrast to the hard stop experienced with unverified HDDs.

However, this partial loophole comes with a catch. Once DSM is up and running, the system flags the non-verified SSDs the same way it flags migrated drives, with warnings in Storage Manager and ongoing notifications.

So while you can proceed, you’ll still be treated to that same red and amber text throughout your DSM environment. Still, for users willing to tolerate the interface alerts, this may provide an interim solution — especially for those who prefer SSDs for quiet, low-power deployments.

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Expanding Existing Storage Pools with Unverified Drives is Blocked

Another key limitation to note is that you cannot expand an existing storage pool using unverified drives — even if your system was initialized using fully supported drives.

We tested this by creating a pool with Synology-approved HDDs, then attempting to add a non-Synology drive as an expansion. While the drive appeared in Storage Manager as “available,” the system refused to proceed with the expansion, citing that the drive was not verified or supported.

This strict enforcement essentially locks users into an all-or-nothing ecosystem. There’s no flexibility to upgrade later using lower-cost or readily available drives unless Synology chooses to add them to the compatibility list down the line.

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M.2 NVMe Drives: No 3rd Party Support for Caching or Storage Pools

Historically, Synology has limited M.2 NVMe storage pools to their own SNV SSDs, but allowed third-party drives for read/write caching. That has now changed in the DS925+ and, presumably, all 2025 series models moving forward.

Our testing confirmed that non-Synology NVMe SSDs are no longer usable at all — neither for caching nor for creating storage pools.

Attempting to configure third-party NVMes results in the same hard block and error messages as unsupported HDDs. At the time of writing, only Synology SNV3400 and SNV3410 drives are listed as supported — both of which are tuned more for endurance than performance, making them a questionable fit for cache-centric workflows.

Pool Expansion Using a 4TB Seagate IronWolf Drive

We attempted to expand the existing migrated RAID pool with an additional 4TB Seagate IronWolf drive (same model, also verified on the DS923+). The drive was physically detected, appeared in Storage Manager, but the system refused to proceed with expansion.

System Message: The additional drive was flagged as incompatible, and any attempt to integrate it into the existing RAID resulted in an error stating that the media is not suitable or not verified. However, if your migrated pool is using SATA SSDs (or you setup the system with unverified SATA SSDs, which is still possible at the time of writing) you CAN expand the pool with likewise SATA SSDs.

Conclusion: The DS925+ does not permit expansion of an existing pool using unverified drives if you are using unverified HDDs, even if the original array consists of the exact same drive model. But SATA SSDs still allow this feature at the moment.

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Pool Expansion Using a 4TB Seagate IronWolf Drive

What if you are using an existing pool that is made up of verified HDDs on the NAS (i.e drives from Synology or drives that are now on the verified compatibility list), but also want to create a 2nd pool, made up of unverified SATA HDDs or SATA SSDs?

Result: As expected, if you use SATA HDDs, then you can ONLY create a new separate pool using verified HDDs. However, SATA SSDs still allow for unverified SSD pools.

Hot Spare Addition Attempt Using Seagate IronWolf Drive

We repeated the process above but this time attempted to add a likewise Seagate IW 4TB drive as a Hot Spare.

Result: Just like the pool expansion test, the additional drive was visible but flagged as unsupported, and DSM blocked any attempts to add this as a failover Hot Spare repair drive with the migrated array.

Recovery of Degraded RAID Pool Using Seagate IronWolf Drive

To test RAID recovery, one of the three IronWolf drives in the migrated SHR array was removed, placing the system into a degraded state. We then inserted a fresh 4TB Seagate IronWolf drive.

Result: DSM detected the new drive but refused to initiate RAID rebuild, citing unsupported media.

Conclusion: Recovery of a degraded array using a Seagate IronWolf drive (unverified for DS925+) is not permitted — even when it’s the same model previously used in the pool.

Drive Removal and Reintroduction to Pool

Lastly, we removed one of the IronWolf drives from the active pool and reinserted it a few minutes later. This drive was part of the original migrated SHR setup.

Result: DSM re-added the drive without issue, recognizing it as part of the existing array. No rebuild or repair was needed, and the system returned to normal status — albeit still with the usual compatibility warnings.

Conclusion: Previously initialized and migrated drives will be accepted back into the same array, provided their identity matches the original configuration. However, these reinserted drives remain flagged as unverified.

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Background: How Synology Got Here

At the time of writing this review, Synology is seemingly waging a war on unverified third-party drives being used inside their systems. Back in 2020/2021, Synology began rolling out their own range of storage media for use in their systems — starting with SSDs and eventually expanding to a range of 3.5-inch server-class and enterprise storage-class hard drives. Over the years, we have seen the brand begin to reduce the number of third-party drives listed as certified and verified for use in the DSM platform and in their NAS server devices. This duality — of promoting their own storage media while supporting third-party drives — has had its balance shifted considerably over the last two major Synology generations and across several updates in DSM.

In 2022, when the brand rolled out an update in DSM 7.1 that changed the system status for any NAS using non-Synology-approved drives to display a warning state, the wider Synology user base was in uproar. Synology would eventually roll this back and, although they never reversed the policy of warning users that their drives were not on the compatibility list, they did soften the system’s response. Fast forward to now, and the brand is again changing its third-party drive verification and compatibility methodologies internally. The 2025 series and onward will strictly require drives that are already listed on Synology’s compatibility list. Why is that a problem? Well — twofold. First, right now only Synology HDDs and SSDs are listed on the official DS925+ compatibility pages, despite the hardware inside the DS925+ being identical to previous Synology hardware from both the 2020 and 2023 generations. Second, Synology’s aggressive approach to enforcement. Previously, users could proceed with installation and simply be warned later. Now, installation is entirely blocked.

This will no doubt be problematic with e-retailers and online dealers unless they make this strict compatibility policy exceptionally clear. The rollout has been inconsistent and unclear at best. It first emerged via a press release on Synology’s German website, and the DS925+ page remains vague on the specifics. It might well be that weeks or months from now, the list of drives supported on the Synology DS925+ and other 2025 NAS systems will expand to include more third-party media. Nevertheless, the messaging has been profoundly unclear. If Synology’s verification tests have changed, they need to clearly explain how and why. If they have reported failures with unverified drives, those results should be shared. In discussions with numerous users online, many agree that Synology is walking a confusing line. Either fully embrace third-party drives as before — or bundle your own media and commit to it. Don’t sit in the middle.

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Future Expansion & Unanswered Questions

Synology has stated that it is working with Western Digital, Seagate, and others to test and certify additional drives for use in the 2025 series. However, they also clarified that the responsibility for verification now lies more with the drive manufacturers, not Synology themselves. This means the pace and outcome of compatibility expansion are largely out of users’ hands — and still leaves early adopters in a restrictive position. We’ve already seen similar policies with M.2 NVMe SSDs in the 2023 generation — only allowing storage pool deployments if you use Synology-branded drives. And while DSM still supports caching with third-party drives in those older systems, that flexibility has now been removed in the 2025 series.

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Conclusion – CHECK DRIVE COMPATIBILITY BEFORE YOU BUY!!!

The Synology DS925+ is a great piece of hardware in many respects, but it arrives with a much more locked-down approach to storage media than any Plus series NAS before it. Users hoping to reuse existing drives, mix-and-match HDDs for flexibility, or use cost-effective SSDs and NVMes from other brands need to reconsider their storage strategy or prepare for an ecosystem that’s increasingly closed. We’ll continue to test newer Synology 2025 devices as they launch and will update this article as compatibility lists evolve and behaviors change. But for now, if you’re planning to buy into this generation — and especially if you need to build on a budget — be aware: the HDDs you might WANT to buy might not be usable with your system – SO CHECK THE COMPATIBILITY PAGES FIRST!.

Stay tuned for more deep-dive comparisons, migration tutorials, and drive compatibility experiments right here at NASCompares. In the meantime, if you are considering purchasing an older generation Synology NAS that has more open and established storage media compatibility, below is a comparison of the Synology DS923+ from 2022/2023 and the new 2025 DS925+ NAS.

OLD Synology vs NEW Synology (DS923+ vs DS925+)

Reasons to Buy the Synology DS923+

Reasons to Buy the Synology DS925+

Faster 2.5GbE Networking Out-of-the-Box – Dual 2.5GbE ports offer higher baseline network speeds (up to 6Gbps aggregated), doubling the network performance compared to the DS923+ without requiring expansion cards. More Powerful Processor (More Cores/Threads) – The V1500B CPU offers 4 cores and 8 threads, delivering superior multitasking and heavier workload handling, especially for virtual machines, multiple users, and simultaneous services. Quieter Operation – The DS925+ operates at a lower idle noise level (20.5 dB vs 22.9 dB), making it better suited for office, home office, or studio environments where sound matters. Higher User and Service Limits – Thanks to the more powerful CPU, the DS925+ supports more Synology Drive users, Synology Office users, Synology Chat users, more concurrent SMB connections, and more virtual machines than the DS923+. Better Out-of-the-Box Experience – With stronger networking, higher multi-threaded performance, and no need for immediate upgrades, the DS925+ is ready to deliver higher performance without any additional investment, perfect for users who want maximum capability from day one.

PCIe Expansion for 10GbE Upgrades – The DS923+ features a PCIe Gen3 x2 slot, allowing users to install a 10GbE network card later, massively boosting network speeds beyond the built-in 1GbE ports. Broader 3rd-Party Drive Compatibility – Unlike the DS925+, the DS923+ allows full system initialization, storage pool creation, and DSM services even with non-Synology hard drives and SSDs—giving users more flexibility and choice. Lower Power Consumption and Heat Output – The DS923+ is slightly more energy-efficient in both active use and hibernation modes, making it a better fit for always-on environments where power savings add up over time. Potentially Lower Price (Especially Post-DS925+ Launch) – As the newer DS925+ replaces it, the DS923+ is likely to see discounts and wider availability, offering excellent value for budget-conscious users without sacrificing capability. Ideal for Customization and Long-Term Scalability – With the ability to upgrade the network, use a wider range of drives, and maintain full DSM functionality, the DS923+ is better suited for users who plan to evolve their setup over time.

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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Synology is closing the gap on third-party hard drive support further in 2025

UPDATE 4 – The Synology DS925+ NAS is NOW LIVE, and that means that the extent to which you can use 3rd Party HDDs and SSDs on the 2025 series (at the time of writing) a now alot clearer. As it stands, it means the following:

If you use Synology 1st Party Drives – Everything is EXACTLY the way it was with Initialization, Storage Pool Creation and System operations:

As discussed on the videos and articles here on NASCompares, if you use HDDs that are NOT on the 2025 generation Synology NAS compatibility list, you will be able to initialize the system out of the box. This is a digniicant departure from when Synology alloed you to install DSM on unverified storage drives on other devices, but did so with warnings and disclaimers during the Storage Pool and Volume setup:

If you have an existing Synology NAS with HDD/SSD that are/were on the compatibility list of your older system, but are currently NOT on the 2025 generation Synology NAS (ie the DS925+, DS1525+, DS1825+, DS225+, DS425+, etc), you CAN still physically migrate the drives and your DSM setup over to the new system – however the system will show multiple ‘At Risk’ and ‘Warning ‘ signs across the board, and Red and Amber text/icons will appear at numerous points in the storage manager. So this is a little jarring to say the least, and if you are a System Installer or hired IT admin that upgrades a client’s setup via this method, defintely take the time to soften the blow with your ‘end user’ if they will be accessing DSM down the line – as it does look very alarming.

Interestingly (and importantly – at the time of writing!), if you install SATA SSDs in the DS925+ 2025 series device (despite them not being listed currently on the Synology media supported compatibility tests) these seemingly let you continue with your DSM installation as normal. However, keep in mind that much like when you physically migrate drives from an older Synology system, that if the SATA SSDs you are using are still not on the 2025 generation device compatibility lists, it will still the same amber and red warnings as before:

Additionally, some users wondered about whether you could expand an exxisting Synology Storage Pool that featured verified drives with an unverified 3rd party HDD after the DSM installation was complete. Sadly, the answer is ‘no’, and choosing the expansion option in the Synology Storage manager when you have the unverified drive installed will show the available drive, but the option to initiate a storage expansion will result in a pop up message telling you that the drive media is not suitable/verified:

When it comes to M.2 NVMes – Synology have strictly adhered by the same support and compatibility stance as they did on the SATA HDD support mentioned above, but also adding that the 2025 generation of devices will not be able to use 3rd Party m.2 NVMe SSDs (that are not on the compatibility list, which is only their own SNV series of drives at the time of recording) for both storage pools AND caching – the latter of which was always possible even with unverified M.2 SSDs.

I am currently running other tests. Synology do say that they are working with WD and Seagate (and others?) to get further drives verified – moving drive verification processes over to the drive media companies themselves. However this does still mean that, at the time of writing, the Synology DS925+ (and any other 2025 series devices that roll out in the very near future) with only the Synology branded drives as a choice.

UPDATE 3 – Synology has now made the DS925+ NAS NAS Product Page live in several of the Eastern regions (China, Australia, Japan – not the Taiwan page yet however). With it, we can now see the official compatibility pages. On the hard drive page there is now only Synology Drive media, and the option to select supported 3rd party HDD choices is removed. For all we know, this will return if/when 3rd party drives from WD and Seagate are verified. But at least for now, it seems the brand is serious about only recommending its own storage media in their 2025 systems at launch:

The full list of drives includes the Synology Plus series of HDDs, the Enterprise class drives and the enterprise class SATA SSDs. However, there are currently no Surveillance class drives listed (WD Purple/Seagate Skyhawk, etc):

In terms of M.2 NVMe SSD support, the brand has also removed any selection of 3rd party SSDs from Samsung, WD, Seagate, etc. I am particularly surprised about this, as their own M.2 drives are good for durability, but performance-wise are much lower than most in the market and whether it is as caching drives or as storage pools, there are definitely a lot of good options in the market. I hope Synology roll out some performance class SSDs to compensate for this very soon.

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UPDATE 2 (22/04) – I have been in communication with several representatives from Synology regarding this matter to get further clarification on this from them. The following statement was provided by a senior Synology representative and provided publicly with their consent :   “Synology’s storage systems have been transitioning to a more appliance-like business model. Starting with the 25-series, DSM will implement a new HDD compatibility policy in accordance with the published Product Compatibility List. Only listed HDDs are supported for new system installations. This policy is not retroactive and will not affect existing systems and new installations of already released models. Drive migrations from older systems are supported with certain limitations. As of April 2025, the list will consist of Synology drives. Synology intends to constantly update the Product Compatibility List and will introduce a revamped 3rd-party drive validation program.” Reason for the new Synology HCL Policy: Each component in a Synology storage solution is carefully engineered and tested to maintain data security and reliability. Based on customer support statistics over the past few years, the use of validated drives results in nearly 40% fewer storage-related issues and faster issue diagnostics and resolution. Each validated hard drive on the compatibility list undergoes over 7,000 hours of comprehensive compatibility testing across platforms to ensure operational reliability. Technical support data shows that validated drives result in a 40% lower chance of encountering critical disk issues. For models that have adopted the new hard drive compatibility policy, severe storage anomalies have decreased by up to 88% compared to previous models. By adhering to the Product Compatibility List, we can significantly reduce the variances introduced by unannounced manufacturing changes, firmware modifications, and other variations that are difficult for end-users and Synology to identify, much less track. Over the past few years, Synology has steadily expanded its storage drive ecosystem, collaborating with manufacturing partners to ensure a stable and consistent lineup of drives with varying capacities and competitive price points. Synology intends to expand its offerings and is committed to maintaining long-term availability, which is not available with off-the-shelf options. We understand that this may be a significant change for some of our customers and are working on ways to ease the transition. Synology is already collaborating with our partners to develop a more seamless purchasing experience, while maintaining the initial sizing and post-install upgrade flexibility that DSM platforms are renowned for.” – Senior Synology Representative on the record.

 

Original Article:

Over the last few years, Synology have not been exact about being forward in supporting. Back in 2021, we started to see the brand reduce the number of third-party hard drives and SSDs on their systems. This diminishing support has manifested itself in two main ways. The first is that drives that are listed on the official support and compatibility pages have significantly reduced, favouring the utilisation of their own growing range of hard drives and SSD media. The second way this has presented itself drew significant criticism in 2022/2023, when utilising third-party hardware resulted in the system presenting warning messages and even service limitations being suggested. It appears that this is something they are putting into force for their new 2025 series of devices. Numerous websites in Germany have today reported that Synology plans to go full first-party drive priority on all systems released from the 2025 generation and onwards. An official statement from Synology via an official source has not been released, but it appears that the brand is going to go hard on pushing their own drives when using their own systems – at least at launch. So, what are the intended limitations for those who want to use non-Synology branded drives from Seagate and Western Digital? And why would Synology do this with their systems that have been open for over 25 years? Let’s discuss.

UPDATE #2 – There is now an official press release by Synology on this, available from Synology.de:

Synology is increasingly relying on its own ecosystem for upcoming Plus models Germany, Düsseldorf – April 16, 2025 – Following the success of the High-Performance series, the company is now increasingly relying on Synology’s own storage media for the Plus series models, which will be released starting in 2025. Users will thus benefit from higher performance, increased reliability, and more efficient support.  “With our proprietary hard drive solution, we have already seen significant benefits for our customers in a variety of deployment scenarios,” said Chad Chiang, Managing Director of Synology GmbH and Synology UK. “By expanding our integrated ecosystem to the Plus series, we aim to provide all users—from home users to small businesses—with the highest levels of security and performance, while also offering significantly more efficient support.”  For users, this means that starting with the Plus series models released in 2025, only Synology’s own hard drives and third-party hard drives certified according to Synology’s specifications will be compatible and offer the full range of functions and support.

There will be no changes for Plus models released up to and including 2024 (excluding the XS Plus series and rack models). Furthermore, migrating hard drives from existing Synology NAS to a new Plus model will continue to be possible without restrictions.  The use of compatible and unlisted hard drives will be subject to certain restrictions in the future, such as pool creation and support for issues and failures caused by the use of incompatible storage media. Volume-wide deduplication, lifespan analysis, and automatic hard drive firmware updates will only be available for Synology hard drives in the future.  Tight integration of Synology NAS systems and hard drives reduces compatibility issues and increases system reliability and performance. At the same time, firmware updates and security patches can be deployed more efficiently, ensuring a high level of data security and more efficient support for Synology customers.

TL;DR: Synology to Restrict Third-Party Drive Functionality on 2025+ NAS Models

Starting with the 2025 generation of Synology Plus series NAS devices, the company appears to be tightening restrictions on third-party hard drives. While you’ll still be able to use non-Synology drives (like those from Seagate or WD), early reports suggest that certain features may be limited or disabled unless you’re using Synology-branded or Synology-certified drives. According to preliminary reporting (not yet officially confirmed by Synology), using third-party drives may restrict (i.e several news reports indicate this, but no official statement/confirmation yet):

• Creation of storage pools

• Access to health monitoring tools

• Volume-wide deduplication support

• Drive lifespan analysis

• Automatic firmware updates

• Access to official Synology support

Older NAS models (up to and including 2024, excluding XS+ and rackmount units) are not affected. Drive migration from existing systems to new ones should remain possible — but full functionality may require Synology drives.

Source – HERE (or click below)

What are the proposed limitations of using third-party hard drives in the Synology 2025 lineup?

Although the brand themselves, at the time of writing, has not officially stated that devices after the 2025 series will only support their drives, sources highlighted on numerous news outlets have detailed that a number of key storage features and functionality are going to be limited. These include health monitoring tools, deduplication features built into DSM, official support from the brand in some cases, and (most worrying of all if it’s true) storage pool support. I’m still waiting for further clarification if this storage pool support limitation to first-party drives is only referring to the use of M.2 NVMEs in storage pools (something we are already aware of from the 2023 series), or whether people are not going to be able to use third-party hard drives in storage pools moving forward in 2025 series releases. But it would seemingly very much indicate the latter. It’s also worth highlighting that this limitation seems to be a ‘launch’ choice and may also mean that drives are granularly added to the supported pages as the likes of WD and Seagate submit compatibility reports. But the message seems to be that Synology themselves will not be the ones who verify the drive compatibility.

It should also be worth highlighting that users who have purchased devices before the 2025 lineup will not be currently affected by this change and will continue to have broader support of third-party hard drives, although even that has diminished since 2021–2022 as it stands. This does bring into question for some whether this broader policy is something that would be applied in a large-scale DSM update down the road, i.e. DSM 7.3 or DSM 8. For now, until we have an official statement from the brand or access to compatibility lists for the intended new products, we need to reserve our full judgement.

Why would Synology reduce compatibility with the majority of third-party hard drives (Seagate and WD)?

There are plenty of reasons why Synology would consider a move like this, for good and for bad. So in the interest of balance, let’s start positive. What are the good reasons why Synology would endeavour to only support the use of their own storage media in their systems?

• To a much smaller group, it allows them to tailor performance and system deployment expectations a great deal more realistically and could result in improved overall performance for all users, as it allows the development of future solutions to be significantly more targeted.
• If Synology solutions only support Synology drives, it allows the brand to be a great deal more effective at reducing the TCO of the system to buyers, as it will be an all-in-one party solution and even opens the door to the brand rolling out bundled systems that will further reduce the total cost of ownership.

• Export costs in the US — Synology centralising the full component list of their products to the end user can also allow them to better absorb any potential costs efficiently and hopefully pass those cost savings onto the consumer, reducing reservations on purchasing the product in light of potential price hikes.
• Support will be a great deal more specialised if end user deployments have fewer variables to consider, resulting in reduced support resolution times and potentially improved support services as an end result for all users.

Beyond the other potential benefits, they will be considering this proposition to drastically reduce third-party hard drive compatibility and utilisation in the 2025 lineup:

• In a word, profit. Having their own storage hard drives as the main — and potentially only — storage option alongside their systems will allow the brand to make profit vertically across the product deployment. For a long time, the brand was only really monetizing the core system itself, which is really only going to be replaced every 7 to 10 years for most users. Storage media, given the escalating growth rate of people’s data, will require a great deal more regular replacement.

• If Synology storage media is largely the only option to buyers, the brand has a greater degree of control over which products are available. So, for example, currently Synology has fewer different capacity tiers and drive variation tiers compared with other brands (i.e. 24TB drives, surveillance-optimized drives, M.2 NVMEs built for performance, etc.), so in some cases a user may have to opt for a larger capacity or a more enterprise-class drive when they might not need to.

• Eliminates smaller-scale purchases. This is a particularly cynical point of view, I know, but a move like this will almost certainly push value series devices significantly more towards the likes of the BeeStation (which are already pre-populated and fixed with Synology storage media) and away from the Plus series, as a divide begins to appear in terms of the overall total purchase price for many users. Alongside upselling their value series to that buyer tier, it will also move only more serious buyers towards the Plus series and higher from 2025 onwards.

All of the above reasoning towards why Synology would prioritise their own drives over that of third parties are my own points of view, but I do think there’s a ring of truth in some of them.7

What are the potential problems surrounding Synology’s push toward its own storage media over third-party drives?

There are several small issues that are worth highlighting in this broader plan of Synology hard drive prioritisation that we should probably touch on — and hopefully ones that Synology themselves will resolve quickly if this is something they’re going to push hard on. Such as:

• The brand inadvertently revealed earlier this year that they are working on a 6 x 2.5-inch SATA SSD system called the DS-625 Slim. However, the only 2.5-inch SATA SSD media the brand has are way too enterprise — the SAT5200 series — and would be like putting a Ferrari engine into a Ford Focus in terms of the disparity in the hardware being used and the price point!

• Synology has still yet to introduce higher-performing M.2 NVMe storage media, and although several of the new 2025 series of devices arrive with M.2 NVMe support, Synology’s own M.2 SSDs prioritise durability over performance. That is a good thing, but users who are not going to be able to use third-party SSDs for caching or storage pools face being restricted to much lower-performing SSDs in these bays.

• How will the system identify the use of third-party drives, and to what extent are these drives going to be limited? Although lots of details have been revealed in the news reports today, we’re still yet to see a full detailing from Synology themselves on an official platform.
• Surveillance utilisation. Synology has an impressive range of surveillance solutions in the NVR and DVA series, as well as support for Surveillance Station on the majority of their systems, but to date, the brand still does not have surveillance-optimised hard drives in its lineup. Surveillance-optimised hard drive media like WD Purple are designed to have much higher write performance leveraging rather than read, and surveillance drives are generally only accessed for a very small percentage of the time when in use. Will third-party drive limitations extend to these systems as well?

I’m still waiting on an official Synology response on this matter, as there have been early indications (such as the Synology DS925+ Amazon.co.uk link 2 days ago) that indicate some of these systems may be arriving in May 2025 — not that far away! So, until we have full and officially backed confirmation on this, still treat it with a grain of salt. I’d be lying if I said I wasn’t a little disheartened by this move by the brand, as although their software is still absolutely the king of the hill in the world of NAS, further restrictions on their more modest hardware to only use their own range of hard drives — versus that of more widely available, globally distributed, and industry veteran–backed drives — seems a very odd move, and one that I think a lot of home/prosumer/enthusiast/SMB users might take issue with.

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