TERRAMASTER D4-320U 4-Bay USB 3.2 Gen 2 Diskless DAS Enclosure

The TERRAMASTER D4-320U is a high-performance 4-bay USB 3.2 Gen 2 direct-attached storage (DAS) enclosure designed for professionals and home users who need fast, reliable external storage. With data transfer speeds up to 10 Gbps, this diskless enclosure supports both 3.5-inch and 2.5-inch SATA HDDs/SSDs, offering flexible capacity up to 88 TB. Its aluminum alloy construction ensures durability and efficient heat dissipation, while the built-in 80mm smart fan keeps drives cool under load.

Advantages

Experience lightning-fast data transfers with USB 3.2 Gen 2 connectivity, achieving speeds up to 10 Gbps. The D4-320U supports multiple RAID modes (0, 1, 5, 10, JBOD, Single) for data redundancy or performance optimization. Hot-swap capability allows drive replacement without powering down, minimizing downtime. The included external power adapter provides stable power, and the Kensington lock slot adds physical security.

Suitable for

• Creative professionals needing fast, expandable storage for video editing, photography, and large file transfers
• Small businesses requiring reliable backup and data archiving solutions
• Home users looking to centralize media libraries or expand storage capacity
• IT administrators seeking a versatile DAS for server or workstation expansion

Key specifications

• Brand: TERRAMASTER
• Model: D4-320U
• Number of Drive Bays: 4
• Drive Interface: SATA III (6 Gbps)
• External Interface: USB 3.2 Gen 2 (USB-C)
• Max Data Transfer Rate: 10 Gbps
• Drive Compatibility: 3.5" SATA HDD, 2.5" SATA HDD/SSD
• Max Capacity per Drive: 22 TB
• Total Max Capacity: 88 TB
• RAID Modes: RAID 0, RAID 1, RAID 5, RAID 10, JBOD, Single
• Hot-Swap Support: Yes
• Cooling System: 80mm Smart Fan
• Enclosure Material: Aluminum Alloy
• Operating System Support: Windows, macOS, Linux
• UASP Support: Yes
• Power Supply: External AC Adapter (12V/7.5A)
• Drives Included: No (Diskless)
• Chipset: JMicron JMS586
• Indicator Lights: Power, Drive Status, RAID Status
• Security Slot: Kensington Lock

Recommendations

For optimal performance, use compatible SATA III SSDs or high-speed HDDs. The D4-320U is ideal for users who require fast, reliable external storage without network overhead. Pair with a USB 3.2 Gen 2 host for maximum throughput.