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TerraMaster

TerraMaster D4-320

TerraMaster D4-320 four-bay USB enclosure, three-quarter view on a white background

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D4-320 enclosure only, drives not included

Interface:
USB 3.2 Gen2 Type-C, up to 10 Gbps; also works over USB 3.0, USB 3.1, Thunderbolt 3 and Thunderbolt 4 host ports
Drive bays:
4 individual disks, no RAID function; each drive appears as its own volume
Compatible drives:
3.5-inch SATA HDDs, 2.5-inch SATA HDDs and 2.5-inch SATA SSDs, up to 32 TB per drive (128 TB total, per the maker)

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Package details

Model: D4-320

The enclosure with power supply; you supply the drives.

Condition:
Confirm new or reconditioned on the listing
Quantity:
Confirm package quantity on the listing
Included essentials:
The enclosure with power supply; you supply the drives.

Important limit: No RAID at all: it is single-disk only, so there is no built-in redundancy

How many units?

Confirm condition, quantity and included accessories on the retailer’s listing.

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Specifications checked November 5, 2026. Full product details

TerraMaster D4-320 4-Bay USB Single-Disk Enclosure

A four-bay USB 3.2 Gen2 (10 Gbps) direct-attached storage enclosure that presents each drive as an independent disk, with no RAID functions, for backups and expandable desktop storage.

Which version should you buy?

Selected package: D4-320 enclosure only, drives not included.

Selected package

Purchase links appear where the exact offer is verified. Confirm the named model, quantity and accessories before ordering.

Watch out

  • The D4-300 is the earlier 5 Gbps model, not this one.
  • No drives are included; the 128 TB figure is the four-bay maximum with 32 TB drives.

Why people pick it

  • USB 3.2 Gen2 10 Gbps link is twice the speed of the earlier D4-300, per the maker
  • Four independent bays give up to 128 TB of expansion with no RAID setup or management
  • Tool-free push-lock trays and hot swapping make drive swaps quick
  • Temperature-controlled fan and damping keep it quiet on a desk, per the maker's figures

Know before you buy

  • No RAID at all: it is single-disk only, so there is no built-in redundancy
  • Direct-attached USB storage, not a network NAS: it serves the one computer it is plugged into
  • Drive speeds are the maker's figures measured with specific WD Red drives; real results vary

Full specifications

InterfaceUSB 3.2 Gen2 Type-C, up to 10 Gbps; also works over USB 3.0, USB 3.1, Thunderbolt 3 and Thunderbolt 4 host ports
Drive bays4 individual disks, no RAID function; each drive appears as its own volume
Compatible drives3.5-inch SATA HDDs, 2.5-inch SATA HDDs and 2.5-inch SATA SSDs, up to 32 TB per drive (128 TB total, per the maker)
Throughput (maker figures)Up to 1,016 MB/s read/write with four drives installed; up to 510 MB/s with a single SSD
Hot swapSupported; drives can be replaced without powering off
Drive mountingTool-free trays with a push-lock latch that secures the tray on insertion
CoolingTemperature-controlled low-noise fan with vibration damping and sound-absorbing panels; below 21 dB(A) in standby, per the maker's test conditions
CompatibilitymacOS, Windows and Linux; plug-and-play with no drivers
Warranty2 years, per the maker

From manufacturer documentation, checked November 5, 2026. Spotted an error? Tell us.

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