The Terramaster F4-425 PLUS NAS Review – The New $500+ NAS Standard?

The TerraMaster F4-425 Plus represents a significant step forward in the brand’s 4-bay NAS lineup, targeting users who demand capable hardware and broad feature support at a mid-range price point. Retailing at $569.99, or $484.99 during its introductory discount, it is positioned to compete directly with systems like the Synology DS925+ and QNAP TS-464, both of which occupy similar price and hardware tiers. TerraMaster’s intention with this model is to deliver a “jack of all trades” device that suits both home multimedia environments and small business offices. Internally, it uses Intel’s quad-core N150 processor, part of the newer Twin Lake architecture, with a base clock of 1 GHz and a turbo frequency up to 3.6 GHz. This CPU is paired with 16GB of DDR5 memory, offering a notable upgrade in bandwidth and responsiveness compared to previous DDR4-based TerraMaster models.

Complementing that performance core are three PCIe 3.0 x1 M.2 NVMe slots and four SATA drive bays, supporting a combined raw capacity of up to 144TB when fully populated. This configuration allows the device to accommodate both large-scale HDD storage for bulk data and high-speed SSD arrays for caching or dedicated performance pools. Dual 5GbE network ports on the rear enable theoretical aggregate transfer speeds exceeding 1,000 MB/s, aligning with the system’s positioning as a performance-focused yet affordable NAS. TerraMaster’s TOS 6 operating system comes preinstalled, providing modernized storage management, AI-based photo organization, and security tools like HyperLock WORM protection and isolation mode. Altogether, the F4-425 Plus arrives as one of the most fully featured mid-tier NAS options available in 2025, combining strong hardware, software maturity, and quiet, power-efficient design suited to both personal and professional use cases.

The Terramaster F4-425 PLUS NAS Review – Quick Conclusion

The TerraMaster F4-425 Plus delivers one of the most complete mid-tier NAS packages currently available, balancing strong hardware, efficient design, and flexible software at a highly competitive price. Its Intel N150 processor, 16GB of DDR5 memory, and dual 5GbE ports provide ample speed for data-heavy workloads, while three M.2 NVMe slots add rare versatility for caching or SSD-based pools. The all-metal enclosure maintains low temperatures and quiet operation, and the TOS 6 operating system has matured into a capable platform with snapshot protection, Docker, virtualization, and AI photo management. Although it lacks premium details such as drive locks and redundant fans, and the interface remains less refined than Synology DSM or QNAP QTS, the F4-425 Plus stands out as a practical and forward-looking NAS. It bridges affordability and professional capability, making it suitable for home users, content creators, and small offices that need reliable, fast, and adaptable network storage.

Terramaster F4-425 PLUS NAS
Amazon in Your Region for the Terramaster F4 SSD NAS @ $569 ($489.99 till 19th Nov)	Terramaster F4-425 PLUS – $569	B&H for the Terramaster F4-425 plus NAS @ $569.99

The Terramaster F4-425 PLUS NAS Review – Design & Storage

The exterior design of the TerraMaster F4-425 Plus maintains the brand’s familiar compact metal chassis but introduces small refinements that improve both usability and thermals. Measuring 150 by 181 by 219 millimeters and weighing just under 3 kilograms, it fits comfortably into a home office or studio setup without generating significant heat or noise. The enclosure is almost entirely metal, with a brushed silver finish that enhances rigidity and passive cooling compared with earlier plastic-faced designs. Four individual drive trays occupy the front panel, each featuring a simple click-and-load mechanism for 3.5-inch or 2.5-inch drives. Although there are no locking latches or LCD displays, the trays are tool-free and straightforward to handle. A single 120mm fan at the rear provides adjustable cooling across smart, low, and high-speed profiles, maintaining an operational noise level as low as 20.9 dB(A) when idle with drives installed, according to TerraMaster’s own test figures.

From a structural perspective, the F4-425 Plus has clearly benefited from improved thermal management. The metal shell acts as a heat spreader, with typical external temperatures ranging from 25 to 27°C across the enclosure after extended operation, even under multi-day workload testing. Internal drive bays were observed to maintain around 27 to 29°C, while the rear ports and fan area registered between 36 and 38°C during prolonged use. These figures indicate an efficient heat dissipation design, aided by the more conductive chassis material and smart fan calibration. For users concerned with energy efficiency, the power draw remains modest thanks to the Intel N150 processor’s low TDP, allowing the system to idle at roughly 13 watts with SSDs installed and scale to around 60 watts under sustained load with four enterprise-class HDDs spinning.

In terms of drive configuration, the NAS supports up to four SATA 6Gb/s drives and three M.2 2280 NVMe SSDs. This combination provides a theoretical maximum raw capacity of 144TB, assuming four 30TB HDDs and three 8TB SSDs. The inclusion of three NVMe slots rather than the more typical one or two is a notable strength. Each operates on a PCIe 3.0 x1 lane, delivering real-world throughput of approximately 800 to 900 MB/s per SSD, suitable for caching or storage pools. This setup makes it possible to allocate two drives for cache acceleration while dedicating the third to an independent SSD-based pool for high-speed operations like video editing or database hosting. Such flexibility is rare at this price point and broadens the system’s appeal to users with both large data sets and high-performance requirements.

Storage management is handled through TOS 6, TerraMaster’s web-based operating system, which supports a wide range of RAID configurations including TRAID, TRAID+, JBOD, and traditional RAID 0, 1, 5, 6, and 10. TOS 6 also enables SSD caching, snapshots, and HyperLock write-once-read-many functionality for data integrity. Users can assign storage pools to specific workloads, such as separating SSD-based scratch space from HDD archival volumes. Combined with the new graphical interface and more detailed health monitoring tools, it provides a much more transparent overview of drive temperatures, utilization, and S.M.A.R.T. status. For additional flexibility, the system supports online RAID migration and expansion, meaning users can start small and scale capacity over time without data loss.

Beyond local storage, the device integrates directly with TerraMaster’s CloudSync service, which connects to providers like Google Drive, OneDrive, Dropbox, and Baidu Cloud. Hybrid storage configurations allow partial replication or tiered backup between the NAS and the cloud, offering an extra level of redundancy for professional workflows. External connectivity through USB 3.2 ports also supports direct backups to DAS enclosures or portable drives. Altogether, the F4-425 Plus’s design emphasizes efficient cooling, solid construction, and versatile storage architecture, making it a flexible foundation for both data-heavy projects and long-term digital archiving.

The Terramaster F4-425 PLUS NAS Review – Internal Hardware

Internally, the TerraMaster F4-425 Plus is structured around Intel’s N150 processor, a 4-core, 4-thread CPU from the Twin Lake generation. Built on a 6W TDP architecture, this chip delivers a significant efficiency advantage over the previous N5095-based systems while offering a higher burst clock of up to 3.6 GHz. The CPU integrates Intel UHD Graphics, allowing 4K hardware decoding for H.264, H.265, VC-1, and MPEG-4, which is particularly beneficial for Plex, Emby, or Jellyfin users who want native transcoding without GPU add-ons.

This combination makes the system viable not only as a file server but also as a local multimedia hub, capable of decoding and streaming 4K video at up to 60 frames per second. Despite being a low-power chip, its instruction set includes AES-NI hardware encryption, ensuring efficient data security without notable throughput loss when encryption is enabled.

The system’s memory architecture uses a single DDR5 SO-DIMM slot, populated with a 16GB non-ECC module by default and expandable up to 32GB. The adoption of DDR5 over DDR4 marks a generational improvement in bandwidth and latency, leading to faster multitasking, smoother virtualization performance, and reduced overhead when handling multiple users or services. The memory module is non-ECC but benefits from on-die error correction at the hardware level, offering stability improvements over standard DDR4 implementations. This approach aligns with the unit’s target demographic of small offices, creators, and advanced home users who want server-grade responsiveness without enterprise complexity.

Storage connectivity within the system is distributed between four SATA III 6Gb/s interfaces managed by an ASMedia controller and three PCIe 3.0 x1 lanes dedicated to M.2 NVMe SSDs. This configuration ensures balanced throughput for simultaneous HDD and SSD activity. Internally, the layout is straightforward, providing easy access to both the memory slot and M.2 bays via the removable top panel. The power supply is a single 90W external brick, keeping internal temperatures lower and simplifying maintenance.

Together, the hardware configuration represents a thoughtful balance between efficiency, expandability, and performance, aimed at users who need consistent data access, multimedia capabilities, and reliable long-term operation without excess noise or heat.

The Terramaster F4-425 PLUS NAS Review – Ports and Connections

The TerraMaster F4-425 Plus offers a broad range of connectivity designed to meet both high-speed networking and general expansion needs. On the rear panel, two 5GbE RJ-45 network ports serve as the central performance feature. These are among the first dual 5GbE implementations in a mid-tier NAS, and each port operates through its own dedicated PCIe 3.0 x1 lane, avoiding bandwidth contention. In testing, each port achieved full theoretical throughput, confirming proper lane allocation. Users can enable link aggregation or SMB multichannel for multi-user workloads, although saturating both ports simultaneously requires fast SSD or hybrid storage configurations. These ports support IPv4/IPv6, VLAN tagging, link aggregation, and Wake-on-LAN, making the system suitable for both small office environments and direct workstation connections.

Complementing the network interfaces, the F4-425 Plus includes four USB 3.2 ports: three Type-A and one Type-C, all operating at 10Gbps. These ports can handle external DAS enclosures, UPS devices, or high-capacity backup drives. The inclusion of a front-mounted USB port improves convenience for ad hoc backups or quick file transfers, addressing a long-standing omission in earlier TerraMaster models. Additionally, an HDMI 2.1 output is positioned on the rear, though its practical use remains limited within TOS, which lacks a native display interface. It may, however, prove useful for third-party operating systems such as Unraid or TrueNAS, where direct console access or local media playback is desired.

Overall, the port layout is clean and efficient, optimized for straightforward cable management. The system’s single large fan sits adjacent to the networking array, allowing for effective airflow without excessive cable obstruction. Power is supplied through a standard barrel connector linked to an external 90W adapter, which helps reduce internal heat buildup. Though it lacks built-in 10GbE or PCIe expansion, the dual 5GbE setup provides more than enough bandwidth for its class, especially when paired with NVMe caching. Users can also connect the NAS to TerraMaster’s USB-based DAS units for storage expansion or off-site replication, offering flexibility without compromising portability or noise levels.

The Terramaster F4-425 PLUS NAS Review – Tests, Noise, Heat and Power Consumption

Performance testing on the TerraMaster F4-425 Plus showed that the system comfortably meets its advertised speed class, particularly when networked over a single 5GbE connection. Using four Toshiba MG-series 7200 RPM enterprise hard drives configured in RAID 5, the system achieved full saturation of one 5GbE port during both AJA and ATTO benchmark tests, reaching consistent read and write speeds around 500 to 520 MB/s. When tested with mixed media files totaling 50.5 GB, it completed the transfer in approximately 3 minutes and 45 seconds, equating to an average throughput of about 224 MB/s.

This is a strong result for a mechanical-drive setup, reflecting efficient caching and balanced SATA bandwidth. SMB Multichannel and link aggregation are supported, though the CPU’s available PCIe lanes limit simultaneous dual-port saturation. Even so, the system handles multiple concurrent transfers and backups without a noticeable decline in throughput.

Testing with NVMe SSDs improved overall responsiveness considerably. The three M.2 2280 PCIe 3.0 x1 slots each sustained sequential transfer rates between 800 and 900 MB/s, allowing the NAS to maintain a high level of random IOPS for metadata-heavy workloads. When used as cache devices, these drives accelerated small-file transfers and application access times, especially when paired with the system’s 16GB of DDR5 memory.

TerraMaster’s TOS 6 supports flexible use of these drives, enabling independent storage pools or hybrid cache layers, depending on the task. In sustained transfers over SMB and iSCSI, the system achieved write speeds close to 950 MB/s and reads near 1020 MB/s when using SSD-based arrays, validating the advantage of dual 5GbE interfaces for all-flash or mixed-tier environments.

Power consumption during operation remained modest, aligning with the platform’s efficient design. With no hard drives installed and three SSDs active, idle draw measured around 13.3 watts. Adding four 7200 RPM HDDs increased idle power to 55 watts and full-load consumption to roughly 61–63 watts under concurrent read/write activity. These figures indicate a well-balanced design that prioritizes power efficiency without restricting performance. Fan speed settings affect both thermals and acoustics predictably: in low-speed mode, the NAS operated near 33 dB(A), while mid and high-speed profiles raised that figure to 37 and 39 dB(A) respectively. During heavy disk operations, readings peaked briefly at around 43 dB(A), which is reasonable given the metal chassis and high-RPM drives used in testing.

Thermal results further underscored the system’s stability. Surface readings from the aluminum body remained between 25°C and 27°C on average, while drive bays hovered at 28–30°C after extended workload sessions. The rear fan exhaust area reached approximately 36–38°C under sustained load. The efficient heat dispersion of the chassis prevented thermal throttling during prolonged transfers or virtualization testing, even with all seven storage devices active. This consistent temperature range indicates that TerraMaster’s choice of single-fan cooling and full-metal housing achieves a practical balance between noise, airflow, and longevity.

The Terramaster F4-425 PLUS NAS Review – Verdict and Conclusion

The TerraMaster F4-425 Plus demonstrates how far the company’s mid-range NAS lineup has progressed in terms of hardware refinement and real-world usability. By combining Intel’s efficient N150 processor with 16GB of DDR5 memory, dual 5GbE connectivity, and triple M.2 NVMe slots, it provides a specification normally reserved for higher-priced units. The build quality, centered around a full-metal chassis and quiet cooling design, contributes to consistent thermals and low power usage even under multi-day workloads. While the design omits premium touches like drive locks or redundant fans, the emphasis on practicality and efficient cooling makes it a dependable solution for continuous operation. From a user experience perspective, the integration of TOS 6 represents TerraMaster’s most stable and capable operating system to date, offering improved security features, cloud synchronization tools, snapshot management, and flexible storage configurations that appeal to both home and small office users.

From a value standpoint, the F4-425 Plus stands out as one of the most competitively priced NAS units in its category. At $569.99, or $484.99 during the initial discount period, it delivers strong network and storage performance that aligns closely with rivals from Synology and QNAP while retaining open installation flexibility for third-party platforms such as Unraid or TrueNAS. Its combination of high-speed connectivity, compact design, and mature software environment makes it an appealing option for anyone seeking a 4-bay system capable of multitasking across media streaming, data backup, and light virtualization. Although it cannot fully match the polish of Synology DSM or the plugin ecosystem of QNAP QTS, TerraMaster has successfully positioned this device as a bridge between affordability and professional performance, solidifying its place as one of the more balanced NAS releases of 2025.

Terramaster F4-425 PLUS NAS
Amazon in Your Region for the Terramaster F4 SSD NAS @ $569 ($489.99 till 19th Nov)	Terramaster F4-425 PLUS – $569	B&H for the Terramaster F4-425 plus NAS @ $569.99

Terramaster F4-425 PLUS NAS PROs

Terramaster F4-425 PLUS NAS CONs

• Dual 5GbE network ports with full independent bandwidth for high-speed transfers + lots of USB-to-5GbE $30 upgrades in the market now • Three PCIe 3.0 x1 M.2 NVMe slots supporting cache or storage pool configurations • Intel N150 processor with integrated graphics enabling 4K hardware decoding and AES-NI encryption • 16GB DDR5 memory (expandable to 32GB) offering improved bandwidth and multitasking performance • Full-metal chassis with efficient thermals, low noise levels, and minimal vibration • Comprehensive RAID and storage management through TOS 6 with snapshot and HyperLock-WORM protection • Supports Docker, virtual machines, Plex, Emby, and Jellyfin natively within TOS 6 • Competitive pricing with strong value relative to Synology and QNAP alternatives

• Cheaper N150 NAS Systems have arrived earlier in 2025 • 5GbE adoption is low, so only larger 10GbE ready groups (via auto-negotiation) will enjoy the benefits of 5GbE • TOS 6 interface and app ecosystem remain less polished than top-tier NAS platforms

 

 

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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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Terramaster F4-425 PLUS (and F2-425 PLUS) NAS Coming Soon

The Terramaster F2-425 PLUS (8 GB, priced around US$399) and F4-425 PLUS (16 GB, priced around US$569) represent Terramaster’s latest step forward in its midrange NAS portfolio, arriving near the end of 2025 as a response to the growing competition from brands such as QNAP, Synology, UGREEN, and Asustor. Both models share the same Intel N150 quad-core processor running up to 3.6 GHz, use DDR5 memory, and include multiple M.2 NVMe slots, positioning them well above Terramaster’s previous generation of Celeron-based systems. The F4-425 PLUS is a four-bay platform that expands on the two-bay F2-425 PLUS by offering higher throughput and significantly greater storage flexibility, making it suitable for heavier workloads and multi-user environments. Terramaster appears to have used this release to redefine what can be expected in the $400–$600 NAS tier, especially by including dual 5 GbE network ports, three NVMe SSD slots, and native hardware transcoding for 4K and even 8K content through integrated Intel UHD graphics. Together these systems aim to deliver competitive all-in-one solutions for home and small-office users who require reliable local backup, multimedia streaming, and virtualization support without moving into enterprise-grade pricing.

Note – The Terramaster F4-425 PLUS and F2-425 PLUS NAS have now been launched, and are available to buy HERE for $569 and HERE for $399 (with 15% off as an introductory price till November 21st)

Terramaster F4-425 PLUS & F2-425 PLUS NAS Hardware Specifications

Terramaster’s F2-425 PLUS and F4-425 PLUS NAS units share a unified hardware architecture centered on Intel’s N150 processor, part of the Twin Lake family. This 4-core, 4-thread CPU operates at a base clock of 1.0 GHz and boosts up to 3.6 GHz, with integrated Intel UHD graphics that support hardware acceleration for 4K and 8K video decoding. While the N150 is not a high-power processor by desktop standards, it provides excellent balance between performance and efficiency for NAS workloads such as Plex or Jellyfin media streaming, file indexing, and lightweight virtualization. The use of this chip also aligns Terramaster’s lineup with newer offerings from competitors who have adopted similar architectures in their 2025 models.

The memory configuration has moved to DDR5, marking a notable generational shift from the DDR4 modules used in previous Terramaster systems. The F2-425 PLUS includes 8 GB of DDR5, while the F4-425 PLUS doubles this to 16 GB, both expandable up to 32 GB. DDR5 provides higher bandwidth and reduced latency, which benefits multitasking environments, particularly when running Docker containers, multiple user sessions, or AI-driven indexing services such as local photo recognition. This upgrade positions the new PLUS series closer to the performance levels found in more expensive NAS systems while maintaining efficient power draw and thermal output. In terms of storage capacity, the F4-425 PLUS can house up to four 3.5-inch or 2.5-inch SATA drives, while the smaller F2-425 PLUS accommodates two. Both models also integrate three M.2 NVMe slots, allowing up to 8 TB per SSD and enabling users to reach a maximum combined capacity of approximately 144 TB in the four-bay model. Terramaster’s hybrid storage design allows these NVMe drives to serve either as a dedicated storage pool or as cache acceleration for HDD volumes, giving users flexibility to prioritize capacity or performance. The inclusion of three M.2 slots is unusual at this price tier and stands out against most two- and four-bay competitors, which typically provide only two.

For network connectivity, Terramaster has equipped both models with dual 5 GbE ports. This configuration effectively doubles the throughput available in the previous 2.5 GbE generation and can deliver an aggregated bandwidth of up to 10 Gbps through link aggregation. Although the lack of a dedicated 10 GbE port might limit direct single-link transfers, the two 5 GbE ports provide redundancy, failover, and multi-user performance advantages. Both models also include a front-mounted USB-C port and rear USB 3.2 Gen 2 Type-A connectors for high-speed external backups and peripheral connections, reflecting a refinement in Terramaster’s chassis design compared with earlier models that relied solely on rear ports.

Cooling and chassis design remain consistent with Terramaster’s recent metal-based enclosures, using active fan ventilation with independent drive bay access. The F4-425 PLUS features dual rear fans to maintain airflow across four bays, while the F2-425 PLUS employs a single high-efficiency unit. The new layout provides improved front-to-rear ventilation and easier access to drive trays. Internally, the systems do not include a PCIe expansion slot, which limits the potential for GPU or high-speed NIC upgrades but simplifies internal lane allocation for the CPU’s nine available PCIe lanes. Terramaster appears to have distributed these lanes between the three M.2 interfaces and dual network controllers to maintain balanced throughput across all functions.

 

How the F4-425 PLUS Compares with QNAP TS-464 and Synology DS425+

The QNAP TS-464 is built around the Intel Celeron N5095, a 4-core, 4-thread processor that can boost up to 2.9 GHz, and ships with 8 GB of DDR4 memory. It supports four SATA bays plus M.2 expansion and includes dual 2.5 GbE ports that can be aggregated for improved bandwidth. QNAP’s system benefits from a mature software ecosystem, offering HDMI output, virtualization support, and extensive backup tools. In performance testing, it delivers sequential speeds around 560 MB/s under RAID 5, limited mainly by network bandwidth. Compared with the F4-425 PLUS, the TS-464 offers stronger software flexibility and PCIe expandability, but its networking hardware is slower and it relies on older memory standards.

The Synology DS425+ takes a more conservative hardware route, using the Intel Celeron J4125 with four cores running at 2.0 GHz base and 2.7 GHz burst. It includes 2 GB of DDR4 memory, expandable to 6 GB, and offers one 2.5 GbE port alongside a 1 GbE port. Two M.2 NVMe slots are available but only for cache acceleration, not full storage pools. Sequential throughput typically reaches about 280 MB/s for reads and writes. Against the F4-425 PLUS, Synology’s system trails in memory, raw processing speed, and throughput potential, but maintains an advantage in software polish and long-term reliability through DSM integration.

In side-by-side terms, the F4-425 PLUS aims for a higher performance envelope. Its dual 5 GbE ports deliver aggregate throughput potential far beyond both the QNAP and Synology options, and its DDR5 memory with three M.2 NVMe slots allows flexible caching or tiered storage setups uncommon at this price tier. The trade-off lies in expandability and software maturity, where QNAP’s platform remains more modular and Synology’s DSM ecosystem offers more stability. For users focused on performance-per-dollar, the F4-425 PLUS introduces hardware that surpasses both competitors on paper, though long-term evaluation will depend on software development under TOS 6.

Terramaster TOS 6 Software

The F2-425 PLUS and F4-425 PLUS both ship with TOS 6, Terramaster’s latest operating system that replaces the earlier TOS 5 platform across its new generation of NAS hardware. TOS 6 introduces a redesigned interface with improved responsiveness and a more modular layout intended to reduce latency during multitasking.

It expands Terramaster’s range of built-in applications to include enhanced TRAID and TRAID+ hybrid array configurations, snapshot scheduling, and real-time data synchronization features. Backup utilities such as Duple Backup, Centralized Backup, TerraSync, and CloudSync provide integration across local drives, offsite NAS devices, and major cloud providers. The system also integrates hardware-assisted AES-NI encryption, supporting secure data transmission over 256-bit TLS and optional two-factor authentication. Although its design remains more lightweight than QNAP’s QTS or Synology’s DSM, it is notably faster to load and more accessible to new users.

Beyond core management tools, TOS 6 also incorporates AI-assisted photo management and multimedia indexing designed to run locally rather than relying on external cloud resources. Its facial, object, and scene recognition algorithms operate entirely on the NAS, avoiding external data transfers while maintaining privacy for personal collections. The OS additionally supports Docker and VirtualBox, enabling light virtualization tasks or deployment of third-party services without command-line setup.

Multimedia servers such as Plex, Emby, and Jellyfin can use Intel’s integrated graphics for hardware decoding, improving playback efficiency in 4K and 8K environments. While TOS 6 still trails mature ecosystems in app diversity, it delivers steady progress toward matching more established competitors, particularly for backup, synchronization, and AI-driven photo organization.

Verdict? The New4-Bay NAS Score to Beat?

The Terramaster F2-425 PLUS and F4-425 PLUS introduce a considerable upgrade to the company’s mid-tier NAS range, setting new expectations for what users can expect at the $400–$600 level. Both models adopt the Intel N150 processor, DDR5 memory, and dual 5 GbE networking, bringing performance that previously required higher-priced hardware. The F4-425 PLUS, in particular, combines four SATA bays with three M.2 NVMe slots, creating one of the most storage-flexible designs in its category. This configuration makes it a practical option for users who require hybrid pools or tiered caching but prefer to remain within consumer-level power and cost limits. Terramaster’s decision to include high-speed networking and DDR5 support at this price point demonstrates an emphasis on raw throughput and bandwidth efficiency, although it comes at the expense of PCIe expandability. From a broader market perspective, the F4-425 PLUS positions Terramaster competitively against alternatives from QNAP and Synology, trading ecosystem maturity for stronger base hardware. TOS 6 continues to evolve, offering usable AI-based media tools, secure backup systems, and local synchronization features. The platform still lacks some advanced management functions and third-party integrations seen in more established ecosystems, yet it now provides sufficient stability and depth for both professional and enthusiast users. Overall, the F4-425 PLUS presents an incremental but strategically significant advancement in Terramaster’s NAS design philosophy, marking a shift toward higher efficiency and versatility within its compact, consumer-oriented systems.

Terramaster F4-425 PLUS NAS – $569 (15% OFF at Launch till 19th Nov)	Terramaster F2-425 PLUS NAS – $399 (15% OFF at Launch till 19th Nov)

 

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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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Terramaster D4 SSD USB4 Enclosure Review

The Terramaster D4 SSD is a four-bay all-flash storage enclosure designed for high-speed external data handling over USB4 connectivity, offering bandwidth of up to 40Gbps. It accommodates four PCIe NVMe M.2 2280 SSDs, allowing a maximum raw capacity of 32TB when fitted with 8TB drives, with larger capacities possible pending future verification. Aimed at professional workflows such as media creation, high-resolution video production, and post-production editing, it is also marketed for gaming environments where low-latency loading and direct game installation are desired. The enclosure does not feature built-in RAID capabilities, instead operating in single-drive mode and relying on the host computer or third-party software for RAID management when required. Measuring 138 x 60 x 140 mm and weighing 392grams, it offers a compact footprint suitable for desktop or mobile editing setups. With active cooling via dual smart fans, wide voltage power input for flexible deployment, and compatibility across USB4, Thunderbolt 3/4/5, and USB 3.x interfaces, the D4 SSD is designed to integrate seamlessly with both Mac and Windows systems, including use as a Mac OS boot drive or as direct expansion for NAS devices with supported ports.

Terramaster D4 SSD Review – Quick Conclusion

The Terramaster D4 SSD is a compact four-bay USB4 NVMe enclosure that delivers high transfer speeds through dedicated PCIe Gen4 x1 lane allocation per drive, managed by the ASMedia ASM2464PDX controller for consistent scaling across single or multiple SSD configurations. While it lacks built-in hardware RAID, this simplifies design, reduces power draw, and allows users to manage RAID through their host system or software tools, offering flexibility for performance or redundancy needs. In testing, it sustained multi-gigabyte throughput under prolonged load without thermal throttling, aided by its dual smart-fan cooling system and low-noise operation, making it suitable for studios and mobile production environments. Its wide voltage input range supports power from standard laptop and mini-PC adapters, and cross-platform compatibility extends to Thunderbolt 3/4/5 and USB 3.x systems, with support for multiple file systems across macOS, Windows, and Linux. Best suited for professionals in media production, post-processing, and high-resolution video editing, the D4 SSD offers a strong balance of speed, efficiency, and portability, though buyers should account for the cost of high-capacity NVMe drives and may wish to add heatsinks for heavy workloads.

Terramaster D4 SSD NAS
Amazon in Your Region for the Terramaster D4 SSD @ $299	B&H for the Terramaster D4 SSD USB4 DAS@ $299.99

Terramaster D4 SSD Review -Design and Storage

The Terramaster D4 SSD adopts a compact and minimalist design that prioritises space efficiency while accommodating high-performance M.2 NVMe storage. The chassis is constructed with a combination of metal and reinforced plastic to balance durability with weight reduction, making it practical for desktop setups or mobile editing stations. Measuring 138mm in height, 60mm in width, and 140mm in depth, it has a footprint smaller than many portable RAID enclosures yet houses four internal M.2 2280 slots. Ventilation is a key part of the design, with perforations along the chassis and an internal airflow path from the bottom intake to the top exhaust. This airflow design is paired with a smart dual-fan system to keep temperatures stable under sustained workloads. The minimalist exterior is free of unnecessary styling, focusing instead on functionality and discrete operation in professional environments.

Internally, the storage layout is based entirely on NVMe architecture, with each of the four bays supporting PCIe Gen4 x1 bandwidth allocation. This ensures each SSD has dedicated lane access to maintain predictable throughput, rather than sharing limited controller bandwidth as seen in some lower-cost enclosures. The D4 SSD supports up to 8TB per drive, giving a maximum raw capacity of 32TB, though higher capacities may be supported as larger consumer and enterprise NVMe drives are verified. This design choice prioritises performance consistency and reduces the risk of bottlenecks, particularly when drives are accessed simultaneously for large file transfers or multi-stream media editing.

The enclosure is not equipped with a hardware RAID controller, meaning all drives operate in independent single-disk mode by default. Users wishing to configure RAID 0, 1, or other levels must do so using their operating system’s built-in storage management tools or third-party RAID software. This approach reduces internal complexity, lowers power draw, and avoids thermal buildup from additional processing hardware, but shifts configuration responsibility to the user. For some workflows, particularly those involving high-performance NVMe SSDs, host-managed RAID can still deliver substantial speed gains without affecting compatibility.

For cooling, the D4 SSD uses an active design with two 50mm temperature-controlled fans. These are managed by four onboard temperature sensors, adjusting fan speeds based on workload and heat generation. The airflow design is optimised to pass directly over the NVMe modules and the mainboard’s heat-generating components. While the unit does not include NVMe heatsinks by default, there is space to install aftermarket options if desired. Terramaster’s decision not to bundle heatsinks reflects a balance between cost and compatibility, as different SSDs have varying thermal needs, and some users may prefer specific heatsink designs.

From a noise and usability standpoint, the D4 SSD is intended to operate unobtrusively in environments such as home offices, studios, and editing suites. In standby mode with SSDs installed, the noise level is measured at 19dB(A), making it quieter than many desktop PCs and suitable for near-silent workspaces. Combined with its small physical footprint, this makes it a storage device that can be positioned close to the user without being a distraction, even under full load during extended transfers or media rendering sessions.

Terramaster D4 SSD Review – Internal Hardware

Inside the Terramaster D4 SSD, the hardware is built around a dedicated USB4 bridge controller, the ASMedia ASM2464PDX, which is designed to maintain high throughput across multiple NVMe drives without the lane bottleneck issues found in some lower-cost enclosures. Each M.2 slot is wired for PCIe Gen4 x1 bandwidth, providing up to 2,000MB/s potential per drive, which is then aggregated and managed through the USB4 interface.

This design ensures predictable scaling in both single-drive and multi-drive use, with performance closely tied to the host system’s RAID or file management configuration. The PCB is perforated in multiple areas to enhance passive airflow in conjunction with the active cooling fans, helping to maintain SSD performance during sustained workloads such as large file transfers or continuous video editing.

The storage slots themselves support PCIe NVMe M.2 2280 SSDs, making the D4 SSD compatible with a wide range of consumer and professional-grade drives. While the official capacity limit is listed as 8TB per drive, the enclosure is not restricted by proprietary firmware, allowing for potential support of larger modules as they become available. The absence of hardware RAID keeps internal processing simple, reducing latency and power draw, while allowing the enclosure to work equally well in macOS, Windows, and certain NAS expansion scenarios where the RAID logic is handled externally. Additionally, the enclosure supports multiple file systems including NTFS, APFS, exFAT, FAT32, and EXT4, depending on the host environment.

Power delivery to the enclosure is handled through a 24W external adapter, with a wide input voltage range of 12V to 20V for compatibility with common laptop and mini-PC power supplies. This not only makes it more versatile for travel or integration into mobile production setups but also reduces the need for proprietary adapters.

The included USB4 Type-C cable is 0.8m in length and rated for up to 80Gbps, significantly higher than the device’s 40Gbps requirement, ensuring minimal signal degradation over time. Thermal and power management are monitored by four internal sensors, which regulate the fan speeds to balance cooling and noise.

Terramaster D4 SSD Review – Connectivity

The Terramaster D4 SSD keeps its external connectivity simple, focusing on delivering the highest possible throughput over a single interface. The primary connection is a USB4 Type-C port located on the rear of the unit, providing up to 40Gbps of bandwidth when used with a compatible host device. This interface also ensures backward compatibility with Thunderbolt 3, Thunderbolt 4, Thunderbolt 5, and USB 3.x standards, although maximum speeds will vary depending on the protocol supported by the connected system. This approach makes the D4 SSD suitable for a wide range of setups, from modern Mac computers and high-end Windows workstations to certain NAS devices that offer USB4 or Thunderbolt connectivity for expansion.

The unit does not draw power from the USB4 connection, which is essential given the requirements of running four NVMe drives under load. This separation ensures stable power delivery regardless of the workload, preventing thermal throttling or performance drops caused by insufficient bus power.

The only other physical interface elements are the cooling ventilation openings, the power button, and status indicators. The ventilation is positioned to support the enclosure’s top-to-bottom airflow, with exhaust positioned to avoid heat recirculation. The power button is recessed to prevent accidental shutdowns, and the indicator lights provide a quick visual status of drive activity. While the D4 SSD avoids additional ports such as USB hubs or SD card readers, this streamlined design prioritises stability and speed for storage operations, aligning with its role as a dedicated high-bandwidth storage enclosure rather than a multifunction docking station.

Terramaster D4 SSD Review – Performance and Tests

In practical testing, the Terramaster D4 SSD demonstrated performance levels consistent with the capabilities of its USB4 interface and internal PCIe lane allocation. When fitted with a single PCIe Gen4 NVMe SSD and connected to a compatible Windows host system, sequential transfer rates reached around 1,480MB/s for reads and 1,140MB/s for writes in CrystalDiskMark, with mixed 70/30 read/write workloads averaging 1,286MB/s.

AJA System Test results with a repeated 1GB file showed roughly 1,400MB/s read and 1,300MB/s write, while ATTO Disk Benchmark recorded peaks of 1.57GB/s read and up to 1.5GB/s write.

These results represent roughly three-quarters of the theoretical maximum per-lane Gen4 x1 performance, with minor variations attributable to SSD model and host configuration.

With four SSDs installed and configured in RAID 0 via Windows Disk Management, throughput scaled significantly.

In AJA testing, read speeds reached 2,500MB/s and writes 2,300MB/s. CrystalDiskMark produced 2,047MB/s reads and 1,927MB/s writes in sequential tests, with mixed workloads at around 1,799MB/s.

ATTO testing peaked at approximately 2.93GB/s read and 2.66GB/s write. These figures are below the absolute maximum possible for USB4 but remain strong for a host-managed RAID array without dedicated hardware acceleration.

The results indicate that with a more capable RAID implementation, sustained speeds above 3GB/s would be achievable, making the D4 SSD suitable for high-bandwidth applications such as multi-stream 4K or 6K video editing. Thermal performance was another key testing area given the high-speed NVMe drives involved. Under sustained load with all four SSDs active, the enclosure’s dual-fan cooling system maintained stable operating temperatures without noticeable thermal throttling. Noise output, even at maximum fan speed, remained low enough for close-proximity use in an editing suite or home office. The absence of included NVMe heatsinks did not lead to significant overheating in tests, though installing aftermarket heatsinks could be beneficial for prolonged heavy workloads or in warmer environments.

Power consumption measurements showed efficient operation relative to its performance. With all drives in hibernation, draw was close to 1W; in standby, it was 3–4W; and at full load, the system used only 5–6W. This efficiency, combined with the wide voltage input support, makes the D4 SSD practical for mobile production setups and continuous desktop use without significant power overhead. Compatibility was confirmed across both macOS and Windows systems, with macOS tests achieving up to 3,257MB/s reads and 3,192MB/s writes using four Samsung 990 PRO 4TB SSDs in RAID 0 on a Mac mini with an Apple M4 chip.

Terramaster D4 SSD Review – Verdict and Conclusion

The Terramaster D4 SSD positions itself as a compact, high-speed, and flexible all-flash enclosure for users who require consistent bandwidth and expandable capacity over USB4. Its PCIe Gen4 x1 lane allocation per drive, paired with the ASMedia ASM2464PDX controller, ensures that performance scales predictably from single-drive use to fully populated configurations without the bottlenecks common in lower-end enclosures that multiplex lanes. While the absence of built-in hardware RAID will be seen as a limitation for users wanting an all-in-one solution, the decision to leave RAID management to the host system helps keep the enclosure’s design simpler, power consumption lower, and thermal output under better control. This host-managed approach also allows greater flexibility in choosing software RAID solutions optimised for specific workflows, whether for performance (RAID 0), redundancy (RAID 1), or other advanced configurations. Combined with its small footprint, professional-grade cooling, and wide voltage input range, the D4 SSD fits naturally into both fixed and mobile setups where reliable sustained throughput is essential.

From a value and application standpoint, the D4 SSD’s test results put it among the faster multi-bay USB4 NVMe enclosures currently available, especially given its ability to sustain multi-gigabyte transfers under prolonged load without thermal throttling. It is particularly well-suited to professionals in media production, post-processing, and high-resolution video editing who need large, portable, and quiet storage capable of handling multiple uncompressed video streams in real time. The unit’s quiet operation, even when all drives are active, makes it practical for use in audio-sensitive environments, and its compatibility with Thunderbolt 3, 4, and 5 as well as USB 3.x protocols expands its usability across a wide variety of systems. Potential buyers should, however, factor in the additional cost of populating all four slots with high-capacity NVMe SSDs and consider adding aftermarket heatsinks for continuous heavy workloads, as none are included. For those who already operate in environments where RAID is managed externally or within the operating system, the D4 SSD represents a balanced combination of speed, efficiency, and build quality that should appeal to both Windows and macOS professionals seeking long-term, high-performance storage expansion.

Terramaster D4 SSD NAS
Amazon in Your Region for the Terramaster D4 SSD @ $299	B&H for the Terramaster D4 SSD USB4 DAS@ $299.99

PROs of the Terramaster D4 SSD

CONs of the Terramaster D4 SSD

High-speed USB4 interface with up to 40Gbps bandwidth, delivering strong multi-bay NVMe performance.   Dedicated PCIe Gen4 x1 lane allocation per slot ensures predictable scaling without lane-sharing bottlenecks. Compact and lightweight chassis with active cooling and low noise output, suitable for quiet work environments. Cross-platform compatibility with Thunderbolt 3/4/5 and USB 3.x, supporting multiple file systems for macOS, Windows, and Linux use. Low power consumption, even under full load, making it efficient for continuous operation.

No built-in hardware RAID functionality, requiring RAID to be managed by the host system or third-party software. No included NVMe heatsinks, which may be needed for sustained heavy workloads. Performance dependent on host system capabilities and RAID configuration, limiting maximum speeds in some setups.

 

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Terramaster D1 SSD Review – Performance Made Sustainable?

The TerraMaster D1 SSD Plus is a compact, single-bay M.2 NVMe enclosure designed to deliver high-speed direct-attached storage over USB4, with a focus on professional workloads that demand both speed and stability. Aimed at users working with large, high-resolution files such as 4K and higher video editing projects, RAW photo archives, and heavy multimedia workflows, it supports transfer rates of up to 3,853MB/s read and 3,707MB/s write when paired with a compatible PCIe Gen 4×4 SSD. This performance level allows a 3GB file to transfer in around one second under optimal conditions, significantly reducing waiting times in post-production processes. The enclosure is compatible with a broad range of connection standards, including Thunderbolt 5/4/3 and USB4/3.2/3.1/3.0, making it adaptable to both modern and legacy system configurations. Measuring 112.5 × 60 × 33 mm and weighing 246g, it features a fully enclosed aluminium alloy body with passive cooling, designed to keep temperatures stable during sustained workloads without introducing fan noise. Additional onboard safeguards provide short-circuit, voltage surge, and electrostatic discharge protection, while its unibody construction aims to withstand continuous use in demanding environments. With no pre-installed SSD, the D1 SSD Plus supports M.2 2280 NVMe drives up to 8TB, giving users the flexibility to choose their own storage based on performance or capacity priorities.

Terramaster D1 SSD Review – Quick Conclusion

The TerraMaster D1 SSD Plus is a compact, bus-powered USB4 enclosure built for sustained high-speed storage with a focus on stability, thermal efficiency, and cross-platform compatibility. Using the ASMedia ASM2464PDX controller with a PCIe Gen 4×4 lane configuration, it can fully exploit 40Gbps bandwidth when paired with a suitable SSD, maintaining 3,000MB/s+ read and 2,500MB/s+ write speeds without throttling during prolonged workloads. Its fully aluminium passive cooling design keeps drive temperatures around 44–45°C under heavy use while remaining completely silent, making it suitable for both desktop and field use. Supporting capacities up to 8TB, multiple file systems, and connection standards including Thunderbolt 5/4/3 and USB 3.x, it integrates easily into macOS and Windows workflows. However, the short 0.3m USB4 cable can limit positioning flexibility, and performance is heavily dependent on choosing a PCIe Gen 4×4 SSD, with no official compatibility list provided. Overall, it offers strong build quality, sustained performance, and portability, making it a capable option for professionals and power users seeking reliable high-speed external NVMe storage.

Terramaster D1 SSD NAS
Amazon in Your Region for the Terramaster D1 SSD @ $109	B&H for the Terramaster D1 SSD USB4 Drive @ $109.99

Terramaster D1 SSD Review – Design and Storage

The D1 SSD Plus adopts a minimalist, industrial-style design built entirely from aluminium alloy, providing both structural durability and efficient passive heat dissipation. Its solid unibody construction not only makes the device more resistant to daily wear but also allows for a larger heat-spreading surface compared to typical plastic or hybrid enclosures. Measuring just over 11 cm in length, it remains small enough for mobile use while retaining the thermal mass needed to handle sustained high-speed transfers without performance throttling. The matte finish helps reduce the appearance of fingerprints and scratches, making it better suited to frequent handling in professional environments.

Internally, the unit supports a single M.2 2280 PCIe NVMe SSD, accommodating capacities of up to 8TB in a single slot. The choice to limit support to NVMe, rather than SATA-based M.2 drives, ensures the interface is not a bottleneck to the USB4 connection. The enclosure uses a PCIe Gen 4×4 lane allocation, meaning that while it can achieve impressive transfer speeds, installing a Gen 3 drive will limit throughput to roughly half the rated maximum. This makes SSD selection critical for users seeking top performance, especially in workflows involving large sequential file transfers or high-speed scratch disk usage.

The passive cooling system is one of the more notable aspects of the D1 SSD Plus’s design. Instead of an active fan, the aluminium chassis itself acts as a heatsink, with thermal pads positioned to draw heat away from the SSD and controller. During testing with repeated large file transfers, drive temperatures peaked at around 44–45°C, and the enclosure exterior measured approximately 41–42°C, remaining well below thermal throttling thresholds. This approach eliminates moving parts, improving reliability and making the device completely silent, a benefit for audio-sensitive production environments.

From a portability perspective, the D1 SSD Plus is supplied with a compact 0.3m USB4 Type-C cable and a soft carry bag for transport. The short cable supports 40Gbps data rates and up to 240W power delivery, though its length may be restrictive for certain setups, such as when connecting to desktop systems positioned under a desk. Weighing just 246grams without a drive, it is light enough to be carried daily yet solid enough to feel substantial in use.

In terms of safety and operational protection, TerraMaster has included components to guard against short circuits, power surges, and electrostatic discharge. These measures, combined with the robust chassis, aim to keep the enclosure operational even in less controlled environments such as on-location shoots or travel-based editing sessions. For storage expansion scenarios, it can act as either a primary drive for active projects or a fast external repository for completed work, depending on the installed SSD’s performance and endurance characteristics.

Terramaster D1 SSD Review – Internal Design

Inside the D1 SSD Plus, the primary component enabling its performance is the ASMedia ASM2464PDX controller. This USB4-to-PCIe bridge is widely used in high-speed external enclosures, offering stable throughput and supporting PCIe Gen 4×4 lane allocation to the installed SSD. TerraMaster is unusually transparent in publicly listing the controller model and lane configuration, information that many manufacturers omit. This clarity helps users understand the real-world performance limits and the importance of pairing the enclosure with a compatible SSD to reach the quoted speeds.

The M.2 slot supports the 2280 form factor exclusively and is physically keyed for NVMe drives, preventing the installation of incompatible SATA models. Internally, thermal pads are pre-positioned to ensure consistent contact between the SSD and the aluminium housing, which doubles as a heatsink. This direct contact method maximises heat transfer efficiency, enabling the enclosure to sustain high-speed operation without thermal throttling. The lack of an active fan reduces power draw and potential mechanical failure points, aligning the product with professional needs for quiet and reliable operation.

The enclosure draws power entirely from its USB4 connection, operating at 5V and consuming up to 7.5W during active read/write workloads. In idle or hibernation mode, this drops to around 5.5W. The absence of a dedicated power supply simplifies setup and enhances portability, though it also means that connection stability is dependent on the host device’s USB port quality and adherence to USB4 or Thunderbolt specifications. This bus-powered approach makes the D1 SSD Plus practical for mobile workstations, ultrabooks, and modern desktops without spare power connections.

Terramaster D1 SSD Review – Connection and Bandwidth

The D1 SSD Plus features a single USB Type-C port located at the rear of the enclosure, serving as its sole data and power interface. This port supports USB4 at 40Gbps, ensuring maximum compatibility with modern high-speed standards while maintaining backward support for Thunderbolt 5/4/3 and USB 3.x generations. This allows the enclosure to integrate into a range of environments, from the latest Apple Silicon systems to older Windows workstations. However, TerraMaster notes that certain Thunderbolt 3-equipped Windows PCs may lack complete USB4 protocol support, which can prevent the device from being recognised unless connected to a different port.

The included 0.3m USB4 cable is rated for the full 40Gbps bandwidth and supports up to 240W of power delivery, even though the enclosure itself draws only a fraction of that power. Its short length makes it well-suited for portable laptop-based workflows but less ideal for desktop systems that require longer reach. Users seeking more flexibility may need to source a third-party cable with equivalent specifications to maintain the enclosure’s full performance potential.

Given the high-speed nature of USB4, signal integrity is critical. The D1 SSD Plus uses a reinforced internal connector to reduce wear and maintain a stable connection over repeated cable insertions. Combined with the aluminium body’s shielding properties, this helps minimise data errors and interference, which is particularly relevant when transferring large multimedia files or working directly from the drive in editing software.

Terramaster D1 SSD Review – Tests

In synthetic benchmarks, the D1 SSD Plus achieved results close to its advertised maximums when paired with a high-quality PCIe Gen 4×4 SSD. Using an AJA 1GB test file loop, sustained read speeds were observed between 3,000 and 3,100MB/s, with writes maintaining 2,550 to 2,600MB/s.

Peak measurements during testing reached 3.55GB/s for reads and 2.8GB/s for writes, confirming that the enclosure can deliver high throughput consistently without early throttling. Mixed workload tests, such as a 70/30 read/write access pattern, still sustained around 2,500MB/s, indicating balanced performance even under varied data operations.

CrystalDiskMark results mirrored the AJA findings, with sequential read speeds consistently exceeding 3,000MB/s and writes holding near 2,600MB/s in repeated trials. These figures place the D1 SSD Plus among the faster single-bay USB4 enclosures currently available, particularly in its ability to sustain speeds over prolonged activity. The stability here is largely attributed to the passive aluminium cooling, which prevented temperature-induced drops in transfer rates that are common in less thermally capable designs.

Real-world file transfers also reflected strong performance. A 100GB mixed-content dataset consisting of video clips, high-resolution images, PDFs, and documents transferred in 63 seconds, averaging 1.58GB/s over the duration. While this figure is lower than synthetic benchmark peaks, it remains well above the speeds of typical USB 3.2 enclosures, providing tangible time savings for users moving large batches of files. The ability to maintain high sustained write speeds is particularly beneficial for workflows such as direct-to-disk recording or continuous large dataset backups.

Temperature monitoring during performance testing showed the installed SSD peaking at 44–45°C after over five minutes of sustained large file writes, with the enclosure’s exterior registering around 41–42°C. These results suggest that the cooling system is sufficient to handle extended workloads without user intervention, making the D1 SSD Plus a viable option for scenarios where the drive may be used heavily for prolonged periods, such as editing directly from the external storage.

Terramaster D1 SSD Review – Verdict and Conclusion

The TerraMaster D1 SSD Plus positions itself as a high-speed, bus-powered USB4 enclosure that places equal emphasis on sustained performance, heat management, and compatibility across multiple connection standards. Its integration of the ASMedia ASM2464PDX controller with a PCIe Gen 4×4 lane configuration ensures that it can fully utilise the available 40Gbps bandwidth when paired with a suitable SSD, avoiding the thermal throttling that can undermine performance in less capable enclosures. TerraMaster’s decision to openly publish controller details, lane allocation, and maximum tested speeds gives technically minded buyers more confidence in what the enclosure can achieve, and helps explain why it maintained stability during repeated multi-gigabyte transfer tests in your review. The combination of a compact footprint, aluminium passive cooling, and complete silence during operation makes it suitable not only for static desktop setups but also for field work, where portability and reliability matter. With support for capacities up to 8TB and a choice of file systems including NTFS, exFAT, APFS, and EXT4, it can be easily integrated into both macOS and Windows workflows without major reconfiguration.

There are, however, practical considerations for prospective buyers. The included 0.3m USB4 cable, while capable of full 40Gbps data rates and 240W power delivery, is short enough to be inconvenient for tower PC users or multi-device workstations, and replacing it with a certified high-speed cable may be necessary in such environments. Furthermore, although the enclosure can accept any PCIe NVMe M.2 2280 SSD, achieving top-tier performance depends on selecting a PCIe Gen 4×4 drive, as using Gen 3 or slower-lane SSDs can halve the potential throughput. Your review also highlighted that while TerraMaster frequently notes the importance of Gen 4 drives, they do not provide detailed compatibility charts or recommend specific models, which could help less experienced buyers avoid suboptimal results. In practice, the D1 SSD Plus delivers a combination of sustained speed, thermal efficiency, and solid build quality that positions it as a strong choice for video editors, media professionals, and advanced home users who require portable storage without sacrificing reliability or performance.

Terramaster D1 SSD NAS
Amazon in Your Region for the Terramaster D1 SSD @ $109	B&H for the Terramaster D1 SSD USB4 Drive @ $109.99

 

PROs of the Terramaster D1 SSD

CONs of the Terramaster D1 SSD

High Sustained Performance – Maintains 3,000MB/s+ read speeds and 2,500MB/s+ write speeds under extended workloads without thermal throttling. Transparent Technical Specs – Clearly states controller model, lane allocation, and maximum tested speeds, aiding informed SSD selection. Robust Passive Cooling – Fully aluminium chassis with integrated heatsink keeps SSD temperatures around 44–45°C under load. Broad Compatibility – Works with USB4, Thunderbolt 5/4/3, and USB 3.x systems across macOS and Windows. Portable and Silent – Compact (112.5 × 60 × 33 mm), fanless design makes it easy to carry and noise-free during operation. Flexible SSD Choice – Supports PCIe NVMe M.2 2280 drives up to 8TB with multiple file system formats (NTFS, exFAT, APFS, EXT4).

Short Supplied Cable – 0.3m USB4 cable may be impractical for certain desktop or fixed workstation setups. Performance Depends on SSD Selection – Using Gen 3 or slower-lane SSDs can reduce speeds by up to half. No Drive Compatibility List – Lacks detailed recommended SSD model chart to guide optimal performance choices.

 

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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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