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

This rugged drive enclosure redefines data protection for on-the-go professionals. The military-grade construction protects your sensitive data from harsh field conditions.  It makes sure you’re equipped for unexpected challenges with a ruggedized water, dust, vibration and shock resistant enclosure.

Industry recognized protection against water and dust, with an IP54 rating

Keep your data safe and secure even through sudden downpours or dust storms. The robust enclosure provides superior water and dust resistance with an IP54 rating.

Drop tested for 4 meters (13 feet)

The rugged drive enclosure is enveloped in a silicone protective sleeve, and engineered to help protect your drive from accidental and unexpected shock, vibrations, and drops. It’s Military MIL-STD-810G rated and test-proven to withstand drops of up to 4 meters (13 feet). It was drop tested using a solid-state drive in the enclosure.

Data protection inside and out

Wherever you go, the rugged drive enclosure delivers reliable data protection, inside and out.  The tough-wearing exterior casing provides shock-resistance, while the flexible silicone sleeve hugs the entire perimeter to ensure an extra measure of protection, absorbing the impact of accidental bumps, rough baggage handling or drops. Inside, an extra layer of silicone provides added drive stability.

Install your drive with ease, with a tool-less design

It’s easy to turn your 2.5in SATA III (6Gbps) solid-state drive or hard drive into external storage. Simply remove the silicone sleeve, open the latch to insert your 2.5"" drive into the rugged enclosure, and plug the included USB cable into the computer or hub USB port. There are no screws or tools needed.

70% faster than traditional USB 3.0, with UASP

Save time in the field, by storing and transferring content quickly. Enhanced with UASP (USB Attached SCSI Protocol), this rugged drive enclosure performs with a 70% faster read speed and 40% faster write speed over conventional USB 3.0, when paired with a UASP-enabled host controller.

UASP is supported in Windows 8, Mac OSX (10.8 or above), and Linux. In testing UASP performs with a 70% faster read speed and 40% faster write speed over traditional USB 3.0 at peak performance.

At the same peak in testing UASP also shows an 80% reduction in required processor resources.

Testing results were obtained using an Intel® Ivy Bridge system, a UASP enabled enclosure, and a SATA III (6Gbps) solid state drive.

The S251BRU33 is backed by a 2-year warranty and free lifetime technical support.

Manufacturer Part Number
Full Product Specifications


  • The full product specifications below are from the manufacturer and may contain information related to other package quantities that will not apply to the product that you are reviewing. Please confirm the actual content and/or package quantity from the main product specifications page.
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Warranty Information
Warranty: 2 Years

Bus Type: USB 3.0 
Chipset ID: ASMedia - ASM1153E 
Compatible Drive Types (Type and Rate): SATA 
Drive Installation: Fixed 
Drive Size: 2.5in 

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) 
Interface: USB 3.0 
Number of 2.5 inch bays: 1 
Number of Drives: 1 
Drive Height(s): 7mm , 9.5mm 

Hot Swap Capability: Yes 
Max Drive Capacity: Tested up to 2TB at 7200 RPM 
Maximum Data Transfer Rate: 5 Gbps 
Type and Rate:
USB 3.0 - 5 Gbit/s 
SATA III (6 Gbps) 
UASP Support: Yes 


Connector A: 1 - SATA Data & Power Combo (7+15 pin) Female 
Connector B: 1 - USB 3.0 Micro-B (10 pin; SuperSpeed) Male 
Drive Connectors: 1 - SATA Data & Power Combo (7+15 pin) Receptacle 
Host Connectors: 1 - USB 3.0 Micro-B (10 pin; SuperSpeed) Female 

Physical Characteristics
Cable Length: 4.1 in [103 mm] 
Color: Black 
Product Height: 1.1 in [27 mm] 
Product Length: 5.7 in [145 mm] 
Product Weight: 7.1 oz [200 g] 
Product Width: 4.4 in [113 mm] 

LED Indicators: 1 - Diagnostic LED (Drive Power and Activity) 

Power Source: USB-Powered 

Humidity: 20% ~ 95% RH 
Operating Temperature: -40°C to 85°C (-40°F to 185°F) 
Storage Temperature: -40°C to 85°C (-40°F to 185°F) 

Packaging Information 
Shipping (Package) Weight: 28.2 oz [800 g] 

What's in the Box

Included in Package:
1 - USB 3.0 rugged 2.5in enclosure 
1 - USB 3.0 cable 
1 - Foam pad for 7mm drives 
1 - Instruction manual