StarTech.com S251BRU33 · External drive enclosure

MPN / P/N

S251BRU33

Manufacturer designation

Rugged Hard Drive Enclosure - USB 3.0 to 2.5in SATA 6Gbps HDD or SSD - UASP

Manufacturer conditions

Windows 7 and earlier Windows versions do not support TRIM; with USB to SATA devices.

Power source

USB-Powered

Input voltage

5V DC

Output voltage

5 DC

Colour

Black

Cable Length

4.1 in [10.3 cm]

Product length

5.6 in [14.3 cm]

Product width

4.4 in [11.2 cm]

Product height

1.1 in [29.0 mm]

Product weight

9.4 oz [265.0 g]

Operating temperature

0C to 85C (32F to 185F)

Storage temperature

-40C to 85C (-40F to 185F)

Humidity

20% ~ 95% RH

Maximum documented data rate

5 Gbps

Type and rate

USB 3.0 (5Gbps)

UASP support

Yes

TRIM Support

Yes

4Kn Support

Yes

Drive interface — source field designation

SATA III (6 Gbps)

Hot-swap capability — manufacturer conditions

Yes

Drive capacity — manufacturer-tested scope

Tested up to 2TB at 7200 RPM

Interface

USB 3.2 Gen 1 (5Gbps)

Bus type

USB 5Gbps

Industry standards

MIL-STD-810G, Method 503.5 (Thermal Shock); MIL-STD-810G, Method 514.6 (Vibration); MIL-STD-810G, Method 516.6 (Shock); MIL-STD-810G, Method 507.5 (Humidity); MIL-STD-810G, Method 509.5 (Salt Spray); MIL-STD-810G, Method 510.5, Procedure I (Sand and Dust); MIL-STD-810G, Method 508.6 (Fungus)

Number of drives

1

Drive size

2.5in

Compatible drive types

SATA

Drive installation

Fixed

Supported drive dimensions — source designation

7mm; 9.5mm

Chipset ID

ASMedia - ASM1153E

LED Indicators

1 - Diagnostic LED (Drive Power and Activity)

Host Connector 1 (Quantity)

1

Host Connector 1

USB Micro-B (5Gbps, 4.5W)

Connector 1 (Quantity)

1

Connector 1

SATA (7-Pin + 15-Pin)

Connector 2 (Quantity)

1

Connector 2

SATA (7-Pin + 15-Pin)

Connector 3 (Quantity)

1

Connector 3

USB Micro-B (5Gbps, 4.5W)

Documented selection limits

Match the exact host interface, peripheral/device protocol, connector, firmware, OS/driver and power requirements before ordering. Published maximum rates are interface limits, not guaranteed application throughput. No universal device or current/future OS compatibility is implied. Storage drive(s) are not included unless this exact SKU explicitly says so. Match 2.5/3.5 inch dimensions or M.2 key/length and SATA versus PCIe/NVMe protocol. USB-C connector shape does not guarantee Thunderbolt or USB4 compatibility. Check supplied adapter and host power requirements; UASP needs host/OS support.

Specification source: StarTech.com ↗
Checked against documentation: 16.10.2026