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4-bay 1U short-depth USB RAID enclosure
QNAP TR-004U 4-Bay 1U USB 3.2 Gen 1 RAID Expansion Enclosure
The QNAP TR-004U is a diskless four-bay, short-depth rackmount RAID expansion enclosure. It can expand compatible QNAP NAS or computer storage and can also operate as direct-attached storage through USB 3.2 Gen 1 Type-C.

What is the QNAP TR-004U?
It is a 1U short-depth USB RAID enclosure with four SATA drive bays, lockable trays and hardware- or software-controlled RAID. The supplied information lists QTS or QuTS hero, Windows, Ubuntu and Mac support.
Explore the DeviceDeal NAS Buying Guide
Compare NAS types, storage planning considerations and practical buying information before choosing your system or expansion accessory.
Rackmount storage features
The supplied information combines four-bay USB expansion with hardware RAID, software control and rack deployment.
NAS expansion or DAS
Use the enclosure to expand compatible QNAP NAS storage or connect it directly to a computer.
Hardware RAID operation
The main chip is described as a microprocessor with hardware RAID.
Multiple RAID modes
Supports Single Disk, JBOD, RAID 0, RAID 1, RAID 5, RAID 5 plus spare and RAID 10.
Lockable drive trays
The supplied description lists lockable trays for controlled drive access.
NAS and computer management
Use Storage & Snapshots on a QNAP NAS or QNAP External RAID Manager on a supported computer.
Short-depth rack design
The 291mm-deep 1U chassis supports the optional RAIL-S01 short rail kit.
Connection and drive requirements
Review these supplied limitations before deployment.
- Direct USB connection: Connect directly to the host USB port without a USB hub or docking station.
- Cable length: A maximum 1-metre USB cable is recommended.
- Drive interface: The bays are SATA 3Gb/s slots; SATA 6Gb/s drives are supported with backward compatibility and limited to 3Gb/s performance.
- RAID group mixing: Only one disk type, HDD or SSD, may be used within a RAID group.
- Hot-swap limitation: The enclosure is listed as hot-swappable, but drive hot-swap is not supported in Individual mode.
- Unsupported adapters: The TR-004U does not support QDA-A2AR or QDA-A2MAR.
- Windows volume limit: Non-Server editions of Windows have a 63TB limit for a single volume; the supplied information recommends Windows Server for larger volumes.
Frequently asked questions
Useful answers based on the supplied information for the QNAP TR-004U.
Does the QNAP TR-004U include hard drives?
No. The supplied specification states that the enclosure is shipped without hard drives.
Which RAID modes does the TR-004U support?
It supports Single Disk, JBOD, RAID 0, RAID 1, RAID 5, RAID 5 plus spare and RAID 10, with hardware- or software-controlled configuration.
Can HDDs and SSDs be mixed in one RAID group?
No. A RAID group must use one disk type only; combining HDDs and SSDs in the same RAID group is not supported.
Can the TR-004U be connected through a USB hub?
No. It should connect directly to the host USB port without a hub or docking station, using a USB cable no longer than 1 metre as recommended.
Is drive hot-swap supported on the TR-004U?
The enclosure is listed as hot-swappable, but the supplied information states that drive hot-swap is not supported in Individual mode.
Can the TR-004U be installed in a rack?
Yes. It is a 1U short-depth rackmount enclosure, and the supplied description lists the optional RAIL-S01 short rail kit for a compatible 19-inch rack.
(TR-004U)
Features and highlights
Key capabilities based on the supplied product information.
Four-bay rackmount expansion
Provides four drive bays in a 1U short-depth chassis.
5Gbps USB Type-C
Uses USB 3.2 Gen 1 Type-C connectivity at the listed 5Gbps rate.
Hardware RAID processor
A microprocessor supports hardware RAID operation.
Broad RAID selection
Includes Single Disk, JBOD, RAID 0, RAID 1, RAID 5, RAID 5 plus spare and RAID 10.
Cross-platform support
The supplied specification lists QTS or QuTS hero, Windows, Ubuntu and Mac.
Optional short rail kit
The supplied description lists the RAIL-S01 for compatible 19-inch rack deployment.
Technical specifications
Specifications below are organised from the supplied product information.
| Brand | QNAP |
|---|---|
| Model | TR-004U |
| Product type | USB hardware RAID DAS and NAS expansion enclosure |
| JBOD connection interface | USB |
| Main chip | Microprocessor with hardware RAID |
| Form factor | 1U short-depth rackmount |
| Drive bays | 4 × 3.5-inch The system is shipped without hard drives. |
| 3.5-inch drives | SATA 3Gb/s slot; supports SATA 6Gb/s hard drives with backward compatibility and performance limited to 3Gb/s |
|---|---|
| 2.5-inch hard drives | SATA 3Gb/s slot; supports SATA 6Gb/s hard drives with backward compatibility and performance limited to 3Gb/s |
| 2.5-inch solid-state drives | SATA 3Gb/s slot; supports SATA 6Gb/s SSDs with backward compatibility and performance limited to 3Gb/s |
| RAID-group disk type | Only one disk type, HDD or SSD, may be used in a RAID group |
| Unsupported adapters | QDA-A2AR and QDA-A2MAR |
| Hot-swappable | Yes; drive hot-swap is not supported in Individual mode |
| USB port | 1 × USB 3.2 Gen 1 Type-C |
|---|---|
| USB transfer rate | 5Gbps, as stated in the supplied description |
| Recommended USB cable length | Maximum 1 metre |
| Connection requirement | Connect directly to the host USB port without a hub or docking station |
| Lockable drive trays | Listed in the supplied description |
| Kensington security slot | Yes |
| System warning | Buzzer |
| Hardware RAID DAS | Yes |
|---|---|
| Single Disk | Yes |
| JBOD | Yes |
| RAID 0 | Yes |
| RAID 1 | Yes |
| RAID 5 | Yes |
| RAID 5 plus spare | Yes |
| RAID 10 | Yes |
| NAS management | Storage & Snapshots Manager, as stated in the supplied description |
| Computer management | QNAP External RAID Manager, as stated in the supplied description |
| Dimensions (H × W × D) | 44 × 439 × 291mm, excluding ear hook and protruding power-supply components |
|---|---|
| Net weight | 4.77kg |
| Gross weight | 5.67kg |
| Optional rail kit | RAIL-S01 short rail kit |
| Power supply | Open-frame 100W; input 100240V, 3.5A, 5060Hz |
|---|---|
| HDD sleep power consumption | 4.79W |
| Typical operating power | 18.9W, tested with drives fully populated |
| Fans | 2 × 40mm, 12VDC |
| Operating temperature | 040°C (32104°F) |
|---|---|
| Storage temperature | -2070°C (-4158°F) |
| Relative humidity | 595% RH non-condensing, wet bulb: 27°C (80.6°F) |
| QTS / QuTS hero | Yes |
|---|---|
| Windows | Yes; non-Server Windows editions have a 63TB single-volume limit, and Windows Server is recommended for larger volumes |
| Ubuntu | Yes |
| Mac | Yes |
| Standard warranty | 3; the supplied datasheet does not state the unit |
|---|
| SKU | TR-004U |
| Model # | TR-004U |
| Barcode # | 885022017706 |
| Brand | QNAP |
| Shipping Weight | 3.1800kg |
QNAP manufacturer warranty
The QNAP TR-004U is supplied with the applicable QNAP manufacturer warranty.
The supplied specification lists a standard warranty value of 3 but does not identify the unit. No duration is stated here. Warranty coverage, eligibility and claim assessment are subject to QNAP terms. Please retain your DeviceDeal tax invoice as proof of purchase.
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