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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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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TB5 M.2 NVMe Pegasus5 from Promise Revealed

At Computex 2025 in Taipei, PROMISE Technology introduced the Pegasus5 M8, an NVMe-based RAID storage system built around Intel’s Thunderbolt 5 interface. This new addition to the Pegasus5 product line focuses on delivering high-throughput, low-latency performance in a compact form factor tailored for professionals working with data-heavy content. Thunderbolt 5 provides a significant increase in bandwidth compared to previous generations, supporting up to 80 Gbps combined data and video transfer, which the M8 leverages for intensive media workflows. The M8 was presented as part of PROMISE’s wider strategy to address evolving demands in high-resolution video production, AI-assisted processing, and portable high-speed storage. Its debut follows the earlier launch of the Pegasus5 R12 and R12 Pro, which introduced 12-bay and hybrid HDD/SSD tower configurations with RAID capabilities, aimed at larger-scale desktop storage environments.

Promise Pegasus5 M8 Hardware Specifications

The Pegasus5 M8 is a compact, all-flash 8-bay direct-attached storage (DAS) system that exclusively supports M.2 NVMe SSDs. It accommodates both standard 2280-length SSDs and 1.5-inch variants, allowing flexibility in selecting drives based on capacity, endurance, or thermal profile. The system supports a mix of TLC-based drives for high performance and QLC-based drives for increased capacity per dollar, giving users the option to tailor the configuration toward speed, cost-efficiency, or a balance of both. Each M.2 slot is connected via a high-speed PCIe backplane, allowing maximum parallel bandwidth to the controller for simultaneous multi-drive operations.

Specification	Details
Form Factor	8-Bay Portable NVMe Storage System
Drive Support	8 × M.2 NVMe SSD (2280 and 1.5-inch supported)
Interface	Thunderbolt 5 (up to 80 Gbps combined bandwidth)
Maximum Throughput	Up to 6,000 MB/s
RAID Support	RAID 0, 1, 5, 6, 10, 50, 60
RAID Engine	PROMISE PromiseRAID with NVMeBoost acceleration
Management Software	PROMISE Utility Pro (macOS and Windows compatible)
Power Delivery	Up to 140W passthrough charging (depends on host capabilities)
Display Support	Dual 6K or single 8K monitor via Thunderbolt 5 DisplayPort tunneling
Thermal Management	Intelligent fan control, internal heat dissipation with SSD thermal pads
Power Supply	Internal, 100–240V AC, 50–60Hz
Compatibility	macOS 13 and above, Windows 10 and later
Dimensions	Not officially disclosed (compact/portable class)
Certifications	RoHS, ErP compliant

The system’s core connectivity is provided by Thunderbolt 5, which doubles the baseline throughput of Thunderbolt 4. In standard mode, it offers 40 Gbps bidirectional data bandwidth, while the Bandwidth Boost mode enables a combined total of up to 80 Gbps for asymmetric workloads—ideal for video-heavy pipelines. In addition to raw data throughput, Thunderbolt 5 also provides support for DisplayPort tunneling, enabling the M8 to drive external monitors (up to dual 6K or a single 8K display) through the same interface used for data. Furthermore, the port delivers significantly enhanced power, with the system supporting passthrough charging of up to 140W, subject to host-side capabilities and cable specification.

Internally, the M8 leverages PROMISE’s NVMeBoost and PromiseRAID technologies for RAID management, data acceleration, and system diagnostics. RAID levels 0, 1, 5, 6, 10, 50, and 60 are supported across the full NVMe SSD array, providing a wide range of redundancy and performance configurations. PromiseRAID includes advanced features such as Predictive Data Migration (PDM), which periodically checks drive health using SMART telemetry and reallocates data proactively in the event of early failure indicators. This is paired with real-time monitoring, automatic rebuild processes, and background consistency checks—all accessible via the PROMISE Utility Pro software.

From a thermal and acoustic perspective, the M8 is designed with intelligent fan control that dynamically adjusts based on system temperature, minimizing noise during idle or low-load periods. The chassis incorporates airflow paths optimized for side-to-side or front-to-back movement depending on orientation, and thermal pads are used to dissipate heat from the M.2 SSDs to internal heatsinks. The power supply is internal, auto-switching between 100–240V AC, and the unit includes power-saving features such as host-synced sleep/wake, contributing to energy efficiency in extended deployment. The system is compatible with macOS 13 and later as well as Windows 11.

In the context of the PROMISE Pegasus5 series, particularly models like the R12 and M8 that utilize Thunderbolt 4 and 5, it’s important to distinguish between upstream and downstream ports as they serve different roles in device connectivity. The upstream port on a Pegasus5 system is used to connect the storage unit to the host computer—typically a Mac or Windows workstation. This is the primary data pathway through which the system is controlled, data is read and written, and device management is executed.

The downstream port, by contrast, enables daisy-chaining or peripheral expansion from the Pegasus unit to additional Thunderbolt or USB-C devices. This could include external monitors, additional storage devices, or other Thunderbolt peripherals. On Thunderbolt 4-enabled systems like the Pegasus5 R12, the downstream port supports dual 4K or a single 8K monitor, allowing it to act as both a storage device and a hub for display and accessory connectivity. On Thunderbolt 5 systems like the M8 or R12 Pro, this downstream capability is expanded further, supporting higher display resolutions and bandwidth-intensive devices without reducing data throughput to the storage array. This separation ensures consistent storage performance even when other peripherals are in use.

Promise Pegasus5 R12 and R12 Pro Specifications

The Pegasus5 R12 and R12 Pro are tower-based storage systems designed primarily for desktop environments where higher raw capacity and mixed-drive support are required. The standard R12 model features 12 bays for 3.5-inch SATA HDDs, supporting up to 288TB using 24TB drives. It connects via Thunderbolt 4 and provides sequential performance of up to 3,000 MB/s. The unit includes dual Thunderbolt 4 ports—one upstream and one downstream—supporting daisy-chaining and external display connectivity. Internally, it runs on a quad-core 2.2 GHz storage processor with 8GB of DDR4 ECC memory, and supports a wide range of RAID levels including 0, 1, 5, 6, 10, 50, and 60, with optional hot spare functionality. Like the M8, it is managed via PROMISE Utility Pro and includes support for Predictive Data Migration.

Specification	Pegasus5 R12	Pegasus5 R12 Pro
Form Factor	12-Bay Tower	12 + 4-Bay Hybrid Tower
Drive Support	12 × 3.5″ SATA HDD	12 × 3.5″ SATA HDD + 4 × M.2 2280 NVMe SSD
Max Capacity	Up to 288TB (12 × 24TB)	288TB HDD + 32TB NVMe SSD (4 × 8TB)
Interface	Thunderbolt 4 (40 Gbps), USB4 compatible	Thunderbolt 5 (up to 80 Gbps), USB4 compatible
Maximum Throughput	Up to 3,000 MB/s	Up to 6,000 MB/s
RAID Support	RAID 0, 1, 5, 6, 10, 50, 60	RAID 0, 1, 5, 10, 50 (NVMe), full RAID for HDD
RAID Engine	PromiseRAID	PromiseRAID with NVMe RAID support
Processor	Storage Processor, 4-core, 2.2 GHz	Same
Memory	8GB DDR4 ECC DIMM	Same
Display Support	One downstream Thunderbolt 4 port (dual 4K or single 8K monitor)	Thunderbolt 5 display tunneling for multiple 6K/8K monitors
Power Delivery	Up to 85W (Thunderbolt/USB4 host)	Up to 140W passthrough charging (host dependent)
Management Software	PROMISE Utility Pro	Same
Operating Systems	macOS 13 and above, Windows 10 or later	Same
Hot Swap / Hot Spare	Supported	Supported
Smart Features	Predictive Data Migration, SMART polling, Intelligent cooling	Same
Dimensions (mm)	318 x 227 x 227	Same
Weight	15.5 kg	Slightly higher (exact value not disclosed)
Power Supply	AC 100–240V, 350W	Same
Certifications	EMC: FCC, CE; Safety: cTUVus, CB; RoHS, ErP	Same

The R12 Pro builds upon this foundation by introducing a hybrid 12+4 bay architecture—adding four M.2 2280 NVMe SSD slots alongside the 12 standard HDD bays. This hybrid layout enables users to implement NVMe-based caching or tiered storage to accelerate performance-critical operations while retaining the high capacity of mechanical storage. The R12 Pro is equipped with Thunderbolt 5 connectivity, offering a data rate of up to 6,000 MB/s and compatibility with advanced display and charging protocols. RAID support is extended to NVMe drives, allowing configurations such as RAID 0, 1, 5, 10, and 50 across the SSD layer. The system retains the same internal architecture and management tools as the standard R12 but introduces higher thermal demands and greater performance headroom due to its dual-media architecture.

Who are the Promise Pegasus5 M8, R12 and R12 Pro For?

The Pegasus5 M8, R12, and R12 Pro are each designed to address distinct storage requirements, aligning with varying workflows and user priorities. The M8 is suited for professionals who require high-speed NVMe performance in a compact and portable form factor. Its use of Thunderbolt 5 and full NVMe support makes it particularly effective for high-resolution video editing (4K to 8K), real-time AI model training, and mobile post-production environments. Its small footprint and low-noise design further enhance its usability for users who operate in constrained or shared workspaces, or who regularly travel with their equipment.

The R12 and R12 Pro are more appropriate for stationary, high-capacity storage needs. The R12, with its 12-bay HDD configuration, supports large media libraries and backup repositories, making it suitable for long-term storage in editing suites or enterprise archive setups. The R12 Pro extends this by incorporating NVMe SSD support alongside HDDs, offering tiered storage capabilities that appeal to users who require a balance between high throughput and large volume. This model is targeted at studios or teams managing high-bandwidth workflows such as multi-stream video processing, where simultaneous access to cached and archival data is necessary.

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OWC Reveals their new OWC Thunderbolt 5 Docking Station

At COMPUTEX 2025, OWC unveiled its latest leap in desktop connectivity with the introduction of the OWC Thunderbolt 5 Dock, a next-generation expansion solution aimed squarely at creative professionals, power users, and demanding hybrid workflows. Demonstrated live at the company’s booth in TaiNEX 1, the new dock consolidates high-speed data transfer, multiple display outputs, wide device compatibility, and substantial power delivery into a single desktop hub. Building on OWC’s legacy of designing hardware that blends reliability with real-world flexibility, the Thunderbolt 5 Dock offers users a central point for managing content-heavy projects, transforming USB-C tablets into full production stations, or anchoring a high-performance workstation setup. Its ability to handle up to three 8K displays, daisy-chain multiple devices, and deliver up to 140W of charging—all while being backward compatible with Thunderbolt 3, 4, USB4, and USB-C—makes it a standout solution for those needing a streamlined, forward-looking expansion unit. Just as importantly, the inclusion of certified Thunderbolt and Dock Ejector software integration ensures data integrity and safe disconnection, a key consideration for anyone working with volatile assets like live video edits, audio mixes, or large-scale backups.

OWC Thunderbolt 5 Dock – Hardware Specifications and Performance

The OWC Thunderbolt 5 Dock introduces a significant step up in performance and versatility for desktop users, particularly those in content creation and technical workflows. Central to the dock’s appeal is its Thunderbolt 5 controller, which supports up to 80Gb/s of bi-directional bandwidth, enabling simultaneous high-speed data transfers and display outputs without bottlenecking. For visual workflows, the dock supports up to three 8K displays or dual 6K monitors on macOS systems, making it a practical tool for video editors working with ultra-high-resolution footage or multitaskers using panoramic screen real estate. The dock also supports multiple daisy chains, allowing professionals to maintain full performance across chained devices, such as external RAID storage, 10GbE adapters, or A/V capture devices, without sacrificing throughput.

Port selection on the Thunderbolt 5 Dock is deliberately broad, designed to cater to nearly every desktop connectivity requirement. The dock features three Thunderbolt 5 (USB-C) ports, two USB-A 10Gb/s, one USB-A 5Gb/s, and a 2.5GbE Ethernet port that supports remote management protocols like Mobile Device Management (MDM), making it suitable for enterprise setups. For storage and media ingestion, dual card slots supporting UHS-II SD and microSD formats allow fast transfers for photographers and videographers. Additionally, a 3.5mm audio combo jack is present for audio input/output, and the dock retains support for Apple’s SuperDrive, offering legacy compatibility that is often overlooked in newer designs.

Beyond the raw hardware, the inclusion of OWC Dock Ejector software adds a layer of operational safety not often found in third-party docks. This utility ensures that all connected drives are safely unmounted before disconnection, protecting against file corruption and data loss. This is particularly important when working with DAW projects or active NLE libraries. Moreover, thanks to Thunderbolt certification, users can rely on cross-platform interoperability and consistent performance whether they’re using macOS, Windows, or even supported Linux distributions. For iPad Pro and USB-C tablet users, the dock serves as a conversion point into a full workstation—adding monitor output, keyboard, storage, and audio capability through a single connection.

Power delivery is another area where the Thunderbolt 5 Dock asserts its future-ready stance. Capable of supplying up to 140W of charging power, it can easily handle even power-hungry notebooks like MacBook Pros or high-end Windows workstations, while also distributing power to connected accessories. The dock intelligently manages power distribution across the ports to maintain stability and avoid overdraw scenarios. As more users transition to single-cable workflows for portable performance and desktop-grade expansion, the OWC Thunderbolt 5 Dock stands out by balancing power, speed, and compatibility in a consolidated form factor.

Is Thunderbolt 5 a Big Jump on Thunderbolt 4, REALLY?

Thunderbolt 5 represents a major leap over Thunderbolt 4 in terms of bandwidth, display support, PCIe throughput, and power delivery—pushing the connectivity standard into a new performance tier. Where Thunderbolt 4 maxed out at 40Gbps, Thunderbolt 5 doubles that with 80Gbps of standard bi-directional bandwidth, and introduces a Bandwidth Boost mode of up to 120Gbps—a key benefit for multi-display setups and high-frame-rate output. Video support has also improved dramatically: while Thunderbolt 4 can manage a single 8K display at 60Hz or two 4K displays, Thunderbolt 5 enables multiple 8K displays or three 4K displays at 144Hz, and even supports a single 540Hz panel—important for ultra-responsive applications like game design, simulation, and high-end color grading.

PCIe bandwidth also sees a doubling, moving from 32Gbps (PCIe 3.0) in Thunderbolt 4 to 64Gbps (PCIe 4.0) in Thunderbolt 5, allowing external SSDs, GPUs, and fast capture cards to perform at significantly higher throughput levels. Similarly, power delivery has increased from 100W to up to 240W, with a new mandatory 140W standard for device charging—enabling the dock to power even high-performance mobile workstations over a single cable. Despite these gains, Thunderbolt 5 remains fully backward compatible with Thunderbolt 4, Thunderbolt 3, and USB-C/USB4 devices, scaling features based on host and peripheral support. As manufacturers like Apple, Dell, and Lenovo begin integrating Thunderbolt 5 into new devices, docks like OWC’s Thunderbolt 5 model are well-positioned to deliver the full benefits of this next-gen interface, particularly in workflows involving heavy media processing, multi-monitor editing suites, and mobile-first productivity ecosystems.

What else did OWC show at Computex 2025?

OWC Envoy Ultra – This rugged portable SSD is built for real-world use in demanding environments. With integrated cable design and speeds exceeding 6000MB/s, it’s ideal for creatives working on location. Compatible across macOS, Windows, iPad Pro, Chromebooks, and Surface devices, the Envoy Ultra offers high-performance external storage in a bus-powered form factor.

OWC Thunderbolt 5 Hub – Designed for users who need more high-speed ports, this compact hub expands a single Thunderbolt 5 connection into three Thunderbolt 5 ports and an additional USB-A port. It supports full 80Gb/s bi-directional bandwidth and up to 120Gb/s for display tasks, making it a scalable solution for device-heavy workspaces.

OWC ThunderBlade X12 – Aimed at film editors and content studios, the ThunderBlade X12 is a RAID-capable SSD offering peak write speeds of 6600MB/s and sustained write speeds of 5990MB/s. It’s designed for high-resolution video workflows where real-time editing and transfer speeds are mission-critical.

OWC Jellyfish – This shared storage solution caters to collaborative editing environments, with scalable capacity from terabytes to petabytes. Supporting 4K to 12K media editing, Jellyfish includes management software and robust security, ideal for teams handling post-production and asset-heavy projects.

OWC Memory Cards and Readers – Built with performance and reliability in mind, OWC’s CFexpress and SD card lines offer fast write speeds and integration with OWC Innergize software, which optimizes performance and checks card health for professional photographers and videographers.

OWC Portable SSDs – Models like the Envoy Pro FX and Express 1M2 continue to serve mobile users with cross-platform support, rugged construction, and high throughput, ensuring reliable data transfer in the field or on set.

OWC Desktop Storage – The Mercury Elite Pro and ThunderBay lines offer RAID-enabled storage for desktop users, with Thunderbolt and USB-C interfaces for speed and versatility. These units are designed for high-capacity needs in media production, backup, and archiving.

OWC Archive Pro Ethernet – A robust LTO-based solution for long-term, high-volume data backup over the network. Tailored for enterprise, media, and government use cases, it supports automated workflows and is optimized for data integrity and longevity in cold storage environments.

OWC Thunderbolt 5 Dock – Release Date and Price

The OWC Thunderbolt 5 Dock is now available for pre-order at $329.99 USD, positioning it as a premium but competitively priced solution for professionals seeking cutting-edge desktop expansion. Each unit includes a certified Thunderbolt 5 cable, external power supply, and access to OWC’s Dock Ejector software, with customer support included. Shipping is expected to begin in early July 2025, following its live showcase at COMPUTEX Taipei. With Thunderbolt 5-equipped laptops and devices entering the market, this dock is one of the first fully certified options to deliver the expanded bandwidth, power delivery, and device flexibility that next-generation workflows demand.

 

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