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Dual Bay SATA External Hard Drive Enclosure - 2 Bay USB 3.0 RAID 3.5in HDD Enclosure

Turn 2 SATA hard drives into external RAID storage, connected through USB 3.0

Product ID: SAT3520U3SR

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  • Dual fixed hard drive bays
  • Supported RAID modes: 0, 1, JBOD
  • SuperSpeed USB 3.0 compliant host interface with support for up to 5Gbps of bandwidth

The SAT3520U3SR USB 3.0 RAID Enclosure turns two 3.5" SATA (SATA I, SATA II, SATA III) hard drives into an external RAID array through a USB 3.0 connection. Large capacity drives (tested with up to 4TB per bay) can be used to greatly enhance your computer storage/backup capabilities.

Whether it's greater capacity or data redundancy you're looking for, this USB 3.0 dual drive enclosure is the solution, with built-in support for multiple RAID modes (RAID 0, 1, JBOD) which enables the enclosure to fit the role you need. The drive enclosure also supports non-RAID operation, so both drives can be used independant.

Compliant with the SuperSpeed USB 3.0 specification, which can provide up to 5 Gbps of data bandwidth (10x more than USB 2.0), the SAT3520U3SR RAID enclosure makes it easier and faster to transfer or stream large amounts of data. Although the dual drive enclosure will perform at peak speeds when connected to a USB 3.0 host computer, it is also more than suitable for use with older systems, as it is backward compatible with USB 2.0 connections.

With a built-in cooling fan the SAT3520U3SR can help extend the life of your hard drives and is backed by a 2-year warranty, and free lifetime technical support.


  • Business applications that require external RAID storage for data redundancy
  • Scenarios requiring easy storage transferability between different computer systems and large volume external storage for backups/archiving
  • Video editing or photography professional/enthusiasts working with very large file sizes

The Advantage

  • Dual bay USB 3.0 enclosure supports the latest USB standard for up to 5 Gbps of data bandwidth for faster data transfers than USB 2.0
  • Built-in support for multiple RAID modes suit most personal/business needs for easier setup
  • USB 3.0 RAID enclosure with a 50mm cooling fan keeps the hard drives cool over extended periods of activity, for optimized performance

Partner Numbers

  • UPC 065030848442


  • Windows 8 logo
  • Linux logo
  • Windows 7 logo
  • Mac OS X Mavericks (10.9) logo
Windows® 8/8.1 (32/64bit), 7 (32/64bit), Server 2008 (32/64), Vista(32/64), Server 2003 (32/64) XP(32/64), 2000
Apple® Mavericks (10.9) OSX Mountain Lion (10.8), Lion (10.7), Snow Leopard (10.6)


Warranty Information Warranty 2 Years
Connector(s) 2 - Drive Connectors SATA Data & Power Combo (7+15 pin)
1 - Host Connectors USB Type-B (9 pin) USB 3.0
Environmental Operating Temperature 0°C to 70°C (32°F to 158°F)
Storage Temperature -20°C to 70°C (-4°F to 158°F)
Humidity 10% ~ 90% RH
Hardware Interface USB 3.0
Bus Type USB 3.0
Number of Drives 2
Drive Size 3.5in
Compatible Drive Types SATA
Drive Installation Fixed
Fan(s) Yes
1 - Fans 50 mm
Chipset ID ASMedia - ASM1051
Silicon Image - Sil5923
Indicators 1 - LED Indicators Power
2 - LED Indicators Drive Power/Activity
Packaging Information Package Height 7.3 in [18.6 cm]
Package Length 10.3 in [26.1 cm]
Package Width 6.0 in [15.2 cm]
Package Quantity 1
Shipping (Package) Weight 4.0 lb [1.8 kg]
Performance Maximum Data Transfer Rate 10 Gbps
Type and Rate USB 3.0 - 5 Gbit/s
UASP Support No
Type and Rate SATA II (3 Gbps)
Hardware Raid Supported Yes
Supported RAID Modes JBOD - (Just a Bunch of Disks)
RAID 0 (Striped Disks)
RAID 1 (Mirrored Disks)
Max Drive Capacity Currently tested with up to 4TB 5400 RPM hard drives per bay (8TB total)
Physical Characteristics Color Silver
Material Aluminum and Plastic
Product Length 7.6 in [19.2 cm]
Product Width 3.0 in [75 mm]
Product Height 4.9 in [12.5 cm]
Weight of Product 2.8 lb [1.3 kg]
Power Power Source AC Adapter Included
Input Voltage 110V-240V AC
Output Voltage 12V DC
Output Current 3000 mA
Software OS Compatibility Windows® 8/8.1 (32/64bit), 7 (32/64bit), Server 2008 (32/64), Vista(32/64), Server 2003 (32/64) XP(32/64), 2000
Apple® Mavericks (10.9) OSX Mountain Lion (10.8), Lion (10.7), Snow Leopard (10.6)
Special Notes / Requirements System and Cable Requirements Available USB 3.0 port

For older 32-bit Windows systems, the maximum supported partition size is 2 TB. Windows will limit the partition size to 2TB, or not properly detect the drive(s) if the size is greater than 2TB per drive/array.

What's in the Box 1 - Included in Package Dual Drive Enclosure
USB 3.0 Cable
Screw Kit
Plastic Stand
Universal Power Adapter
Instruction Manual
3 - Included in Package Power Adapter Plug (NA/EU/UK)



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Product Support

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We are always ready to assist you with any questions you may have.

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Frequently Asked Questions


When you troubleshoot issues with a hard drive enclosure, there are some quick tests that you can complete to rule out potential problems. You can test to make sure that the following components are working correctly and are not the source of the issue:

  • Cables
  • Hard drives
  • Hard drive enclosure

To test your setup components, try the following:

  • Use the cables, hard drives, and hard drive enclosure in another setup to see if the problem is with the components or the setup.
  • Use a different cable, hard drive, and hard drive enclosure in your setup to see if the problem persists. Ideally, you should test a component that you know works in another setup.

When you test the hard drive and hard drive enclosure, it is recommended that you do the following:

  • To check Disk Management, press the Windows key + R, type diskmgmt.msc, and press Enter. Check to see if your hard drive is listed.
  • If the hard drive is listed with unallocated space, the hard drive needs to be reformatted. Right-click unallocated and click New Simple Volume. Follow the on-screen instructions to complete the reformatting.​

Note: Formatting a hard drive erases all of the data on it. Make sure that you back up all of your data before you reformat the hard drive.​

  • If the hard drive is listed as healthy but does not have a drive letter, for example, C:, right-click healthy and click Change Drive Letter and Paths. Click Add, assign a drive letter, and click OK.

Note: A formatted hard drive will not show up in Computer or My Computer until it has a drive letter assigned to it.

Compliance and safety

Compliance letters

Safety Measures

  • If product has an exposed circuit board, do not touch the product under power.
  • If Class 1 Laser Product. Laser radiation is present when the system is open.
  • Wiring terminations should not be made with the product and/or electric lines under power.
  • Product installation and/or mounting should be completed by a certified professional as per the local safety and building code guidelines.
  • Cables (including power and charging cables) should be placed and routed to avoid creating electric, tripping or safety hazards.
*Product appearance and specifications are subject to change without notice.

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