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TERRAMASTER D4-320U - 4-bay 1U rackmount hard drive enclosure, USB 3.2 Gen2 10 Gbps (diskless)
Hard drive enclosures

TERRAMASTER D4-320U

The D4-320U puts four drive bays in a 1U chassis only 241 mm deep. It fits standard server racks without rails and can expand the storage of a TERRAMASTER NAS.

Bays
4 x SATA
Interface
USB 3.2 Gen2, 10 Gbps
RAID
No (individual disks)
Drive format
3.5″ / 2.5″ HDD, 2.5″ SSD
  • 1U rackmount, 241 mm deep, 3.2 kg
  • Four bays, up to 120 TB (30 TB per drive)
  • USB 3.2 Gen2, up to 1,016 MB/s
  • Storage expansion for TERRAMASTER NAS (TOS 5.1+)
  • USB-C to C and USB-A to C cables included
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Day to day

  1. 1The 1U chassis is only 241 mm deep and weighs 3.2 kg, fitting standard server racks without rails.
  2. 2USB 3.2 Gen2 reaches up to 1,016 MB/s with four hard drives and 510 MB/s with a single drive.
  3. 3Four bays accept drives of up to 30 TB each for up to 120 TB of storage.
  4. 4Connected to a TERRAMASTER NAS running TOS 5.1 or later, it expands storage pools and arrays managed by TOS.
  5. 5Plug-and-play with no drivers, compatible with Windows, macOS and Linux.
  6. 6Compatible with USB4, USB 3.2, 3.1 and 3.0 as well as Thunderbolt 5, 4 and 3 ports, with both cable types included.

Real-life uses

Small server room

Add four drives of capacity to a rack in a storage cupboard or office.

NAS expansion

Extend the storage of a TERRAMASTER NAS running TOS 5.1 or later over USB.

Central backup store

Keep backup drives for a small business in one compact rack unit.

Right for you if…

Small businesses and home offices with a server rack who want compact, centralised storage.

Check before you buy

Supplied diskless; the D4-320U has no RAID of its own and works with individual disks. NAS expansion requires a TERRAMASTER NAS running TOS 5.1 or later.

Specifications

Drive bays
4
Format
1U rackmount, 241 mm deep
Weight
3.2 kg
Interface
USB 3.2 Gen2 Type-C, 10 Gbps
Speed (4 HDD)
Up to 1,016 MB/s
Maximum capacity
120 TB (4 x 30 TB)
RAID
Not supported, individual disks
In the box
USB-C to C and USB-A to C cables, power adapter
Drives included
No (diskless)

Frequently asked questions

Do I need rails to install it?+

No. The short 1U chassis fits standard server racks without rails.

Can it expand my TERRAMASTER NAS?+

Yes, with a TERRAMASTER NAS running TOS 5.1 or later; arrays are then created through TOS.

Does it have hardware RAID?+

No. The D4-320U works with individual disks only.

TERRAMASTER D4-320U

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