TERRAMASTER
TERRAMASTER D4-320U Hard Drive Enclosure - 4Bay 1U Rack Mount USB 3.2 Gen2 10Gbps Type-C External USB Storage Compact Chassis Hot Swappable Plug and Play (Diskless)
*Price sourced from Amazon.com. Last updated 2026-04-26. Price and availability subject to change.
Key Features
- Compact Design for Seamless Deployment:The D4-320U hard drive enclosure (a DAS, NOT a NAS) redefines convenience with itsminiaturized 1U rackmount form factor. Measuring just 241mm (9.5 inches) indepth, 50% shorter than traditional chassis and weighing 3.2kg, this sleek enclosure fits effortlessly into standard server racks without the need for rails, simplifying installation. Its space-efficient design maximizes room utilization in data centers, storage closets,stairwells, or offices, making it an ideal choice for small businesses and SOHO users seeking centralized storage solutions.
- High Speed: The D4-320U HDD enclosure adoptsUSB 3.2 Gen2 protocol for high-speed data transmission up to 10Gbps. With 4 hard drives installed, the read/write speed can reach up to 1,016MB/s (SATA III HDD 8TB x 4). With one hard disk installed, the read speed can reach 510MB/s (SATA III HDD 1TB SSD x 1).
- Super-large Storage Space: The D4-320Udirect attached storage can support up to six 3.5" and 2.5" SATA HDD, as well as 2.5" SATA SSD, with a maximum capacity of 30TB per drive, providing users with up to 120TB (30TB x 4) of storage space. Note that the D4-320U does not support arrays and only works with individual disks.
- Expandable NAS Integration: Optimized for TerraMaster NAS devices running TOS 5.1 or higher, the D4-320U external HDD enclosureconnects via USB to expand storage pools and create arrays through the robust TOS system.This feature makes it a powerful companion for users looking to scale their NAS capacity with ease.
- Plug and Play, Highly Compatible: The D4-320U USB storage is a plug-and-play device that doesn't require drivers to work. It is highly compatible with MAC, Windows, and Linux operating systems. It has a USB Type-C interface and comes with two USB cables (1 x USB type C-C cable, 1 x USB type A-C cable). The device is compatible with various computer interfaces, including USB 4.0, USB 3.2, USB 3.1, USB 3.0, Thunderbolt 5 , Thunderbolt 4, and Thunderbolt 3.
Full Specifications
| Brand | TERRAMASTER |
|---|---|
| Weight | 3.2kg |
| Material | Metal |
| Unit Count | 4.0 Count |
| Connectivity | USB |
| Model Number | D4-320U |
| Compatibility | Mac, Linux |
| Built-In Media | Power Adapter, Quick Installation Guide, USB Cable |
| Mfr Part Number | D4-320U |
| Hardware Platform | Windows, Mac, Linux |
| Compatible Devices | Windows, Mac, Linux |
| Data Transfer Rate | 10 Gigabits Per Second |
| Enclosure Material | Metal |
| Hardware Interface | USB 3.2 Gen 2 |
Ready to buy?
TERRAMASTER D4-320U Hard Drive Enclosure - 4Bay 1U Rack Mount USB 3.2 Gen2 10Gbps Type-C External USB Storage Compact Chassis Hot Swappable Plug and Play (Diskless) is available on Amazon with Prime shipping and the full Amazon returns policy. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
*Price sourced from Amazon.com. Last updated 2026-04-26. Price and availability subject to change.
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