USB 3.0 / eSATA Dual-Bay Trayless 3.5” SATA III Hard Drive Enclosure with UASP - 2-Bay SATA 6 Gbps Hot-Swap HDD Enclosure

Connect two hot-swappable 3.5" SATA III hard drives to your computer externally through USB 3.0 with UASP or eSATA

Product ID: S352BU33RER

  • Supports SATA III (6 Gbps) and UASP (5 Gbps) for optimal performance
  • Hardware RAID with support for RAID0 / RAID1 / BIG / JBOD
  • Trayless removable HDD slots with drive locks
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  • Compatible with SATA revision I/II/III (1.5/3.0/6.0 Gbps) drives
  • Compatible with USB 3.0/2.0/1.1 (5 Gbps / 480 Mbps / 1.5 Mbps)
  • Front-mounted RAID controller
  • USB 3.0 and eSATA cables included
$191.99 CAD
236+ In stock
In stock
CA: 27 | US: 209
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The S352BU33RER 2-Bay RAID enclosure lets you build an external RAID array with two 3.5” SATA hard drives, and connect to your computer through USB 3.0 or eSATA.

For fast performance and efficient data transfers, the enclosure supports SATA III transfer speeds -- up to 6 Gbps when connected through eSATA. The versatile RAID enclosure can also be connected through USB 3.0, with support for UASP, performing up to 70% faster than conventional USB 3.0 when paired with a UASP-enabled host controller. See our UASP testing results below for further details.

The external RAID enclosure features a hardware RAID controller, supporting JBOD, Spanning, RAID 0, and RAID 1 -- to achieve greater drive capacity, or secure data redundancy. The RAID controller is also front mounted for ease of access when changing your RAID mode.

For fast and easy drive installation and removal, the dual drive enclosure features a convenient trayless system that eliminates having to mount and fasten your drives, saving time and hassle.

To ensure compatibility with your computer system, the S352BU33RER supports all of the leading operating systems, including: Microsoft Windows® (8/7/Vista/XP/Server 2008/Server 2003), Apple® OSX (10.9/10.8/10.7/10.6), Linux, and Google Chrome OS™.

The S352BU33RER is backed by a 2-year warranty and free lifetime technical support.

Improved Performance with UASP

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.

UASP Speed Diagram

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

UASP Speed Diagram

Testing results were obtained using an Intel® Ivy Bridge system, a UASP-enabled Enclosure, and a SATA III solid state drive.

The Advantage

  • Versatile connectivity options, through either USB or eSATA
  • Maximize performance, with file transfer speeds up to 6Gbps using eSATA
  • Achieve greater drive capacity or secure data redundancy with a built-in hardware RAID controller


Build an external RAID 1 array for data redundancy, to protect against drive failure when working with important data

Externally work with very large files securely in video editing or photography applications

Quickly transfer large data files from your computer to a secure external RAID enclosure

Technical Specifications

Warranty Information
Warranty 2 Years
Bus Type USB 3.0
Chipset ID JMicron - JMS562
Compatible Drive Types SATA
Drive Installation Removable
Drive Size 3.5in
Fan Bearing Type Sleeve Bearing
Fan(s) Yes
Fans 1 - 70 mm
Front Door Key Lock Yes
Interface USB 3.0 & eSATA
Number of Drives 2
Number of internal 3.5 inch bays 2
Air Flow Rate 12.72 CFM
Hot Swap Capability Yes
Max Drive Capacity Currently tested with up to 4TB 7200 RPM 3.5" hard drives per bay (8TB total) and 2TB 5900 RPM 2.5" hard drives (2TB total)
Maximum Data Transfer Rate 6 Gbps
Noise Level 26.24 dBa
Port Multiplier Yes
Supported RAID Modes BIG (Spanning or Concatenation)
JBOD - (Just a Bunch of Disks)
RAID 0 (Striped Disks)
RAID 1 (Mirrored Disks)
Type and Rate USB 3.0 - 5 Gbit/s
SATA III (6 Gbps)
UASP Support Yes
Drive Connectors 2 - SATA Data & Power Combo (7+15 pin) Receptacle
Host Connectors 1 - USB Type-B (9 pin) USB 3.0 Female
1 - eSATA (7 pin, Data) Female
OS Compatibility OS independent; No software or drivers required
LED Indicators 1 - HDD 1 Activity
1 - HDD 2 Activity
Input Voltage 110V-240V AC
Output Current 3 A
Output Voltage 12 DC
Power Consumption (In Watts) 36
Power Source AC Adapter Included
Humidity 20%RH~80%RH
Operating Temperature 5°C to 35°C (41°F to 95°F)
Storage Temperature -20°C to 50°C (-4°F to 122°F)
Physical Characteristics
Product Height 4.6 in [118 mm]
Product Length 8.5 in [215 mm]
Product Weight 64.7 oz [1834 g]
Product Width 5.1 in [130 mm]
Packaging Information
Shipping (Package) Weight 6.3 lb [2.9 kg]
What's in the Box
Included in Package 1 - USB 3.0/eSATA Dual 3.5" SATA HDD Trayless Enclosure
1 - eSATA Cable
1 - USB 3.0 Cable
2 - Drive Bay Keys
1 - Universal Power Adapter (NA/UK/EU)
1 - Instruction manual
Supports any operating system.
No additional drivers or software required.



USB 3.0 / eSATA Dual-Bay Trayless 3.5” SATA III Hard Drive Enclosure with UASP - 2-Bay SATA 6 Gbps Hot-Swap HDD Enclosure

Customer Reviews

3 (2 reviews)
3 out of 5 stars
Quality of Product
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1 - 2 of 2 Reviews

(2 stars) rigid case but has areas for improvement

after around a year or two of constant work as a server raid datastorage the fan stopped working. Replacing it is possible but plug is a bit hard to reach. The documentation, especially for the LED signals should be dramatically improved - some forums are better information sources than the official manual. Something I am currently struggling with and I can't find any info about, is if this enclosure is compatible with 4Kn drives - I have put two 6TB 4Kn (HGST) drives in now and did some tries but do not have the feeling it works (attached via eSATA or USB to a Ryzen 7 system on win10). One LED is constant blue, one LED is constant purple (=red) for over half an hour now and the PC doesn't detect anything. At some point the discs also slow down. Same situation with only 1 drive plugged in. The HDDs themselves are new and both ok and detected fine when directly attached to the internal SATA ports of the PC. The controller is a JMicron - JMS562 which (bad) documentation is also not mentioning 4Kn support, only Win8 compatibility is assured which would speak pro 4Kn, but I fear this is not the case. The enclosure itself is rigid and easy to use. the eSATA cable could be fixed a bit better, but it's ok. the probably missing 4Kn support and the bad LED documentation as well as the broken fan however make me rate it with 2-3 stars max. Oh, and I also lost the raid 1 one or two times with the old disks and was glad I had some backups...
Comment Helpful? Yes - 0 No - 0 Report
Response from
Brian, Customer Support
Thanks for sharing your feedback. We really apologize for the confusion about the LEDs and 4Kn drive support. We'd be happy to replace the fan if the product is within the 2 year warranty period. Regarding the LED behavior, during normal operation each drive LED will be solid blue. When there is drive activity a red LED will also flash making it appear purple. When the Rebuild light is on the array has encountered an error. The rebuild light will flash while the array is rebuilding. During the rebuild process both drive activity lights will flicker frequently appearing purple. We'll update our online manual to include this information. Unfortunately this model does not function with 4Kn drives. We recommend our S352BU313R if you require a 2 bay enclosure with RAID functionality and the ability to use 4Kn drives.

(4 stars) Works good with some tweaking.

I had it for 4 months. I wanted a Raid0 for my games. Tried the 3.0. USB cable and it initialized great but I lost my raid after a couple of days. Also, I had to connect and disconnect everytime my laptop when to sleep or idle for too long. I tried disabling all USB sleep times and nothing. I kept losing my Raid0 after a while. Then I got a brainstorm and decided to use the eSATA to USB that I bought with it which I did not think I need it. I connected the eSATA side to the enclosure and the USB directly to the laptop bypassing all HUBS. WORKED GREAT. It has been three months now and my Raid0 is intact half way full with games and works super fast and my games have no lag whatsoever. the only thing I dont like is this humming sound it makes when it turning on or off. It makes me feel like is about to fail. Is not my drives is the enclosure making that weird, old sound humming. Other that that, it has been working great with the eSATA to USB cable.
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