Dual 3.5in USB 3.0 Hot Swap Trayless SATA Hard Drive Enclosure w/ Fan

Connect Two Removable SATA Hard Drives through a Single USB 3.0 Connection

Product ID: SAT3520U3R

  • Trayless design: 3.5in drives are not mounted to a tray or the enclosure chassis/frame
  • SuperSpeed USB 3.0 compliant host interface, which supports transfer rates up to 5 Gbps
  • RAID support: 0, 1, BIG (Concatenation), JBOD
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  • Backward compatible with USB 2.0 systems, out of the box
  • 55mm cooling fan
  • Lockable drive doors
  • Power and Activity LED indicators
  • Plug-and-Play and Hot-Swap compatible
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Technical Specifications

Warranty Information
Warranty 2 Years
Chipset ID JMicron - JMS551
Compatible Drive Types SATA
Drive Installation Removable
Drive Size 3.5in
Fan(s) Yes
Fans 1 - 55 mm
Interface USB 3.0
Number of Drives 2
Insertion Rating 15, 000 cycles
Max Drive Capacity Currently tested with up to 4TB 5400 RPM hard drives per bay (8TB total)
Supported RAID Modes BIG (Spanning or Concatenation)
JBOD - (Just a Bunch of Disks)
RAID 0 (Striped Disks)
RAID 1 (Mirrored Disks)
Temperature Alarm No
Type and Rate USB 3.0 - 5 Gbit/s
SATA II (3 Gbps)
UASP Support No
Drive Connectors 2 - SATA Data & Power Combo (7+15 pin) Receptacle
Host Connectors 1 - USB Type-B (9 pin) USB 3.0 Female
OS Compatibility OS independent; No software or drivers required
Special Notes / Requirements
System and Cable Requirements Available USB port
LED Indicators 2 - Activity (blue)
2 - Power (blue)
Input Voltage 110V-240V AC
Output Current 3A
Output Voltage 12 DC
Power Source AC Adapter Included
Humidity 8% ~ 90% RH
Operating Temperature 5°C to 80°C (41°F to 176°F)
Storage Temperature -40°C to 70°C (-40°F to 158°F)
Physical Characteristics
Color Black
Enclosure Type Aluminum and Plastic
Product Height 5.3 in [135 mm]
Product Length 8.3 in [210 mm]
Product Weight 30.3 oz [858 g]
Product Width 3 in [76 mm]
Packaging Information
Package Quantity 1
Shipping (Package) Weight 3.4 lb [1.5 kg]
What's in the Box
Included in Package 1 - Hard Drive Enclosure
1 - USB 3.0 Cable
3 - Power Cord (NA/UK/EU)
1 - Universal Power Adapter
1 - Instruction Manual
Supports any operating system.
No additional drivers or software required.


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821+ In stock In stock
US: 795 | CA: 26
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Dual 3.5in USB 3.0 Hot Swap Trayless SATA Hard Drive Enclosure w/ Fan

Customer Reviews

4 (1 reviews)
4 out of 5 stars
Quality of Product
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1 - 1 of 1 Reviews

(4 stars) MacPro USB 3

Drive is ejected on MacPro sleep. Apple issue or hardware compatibility is unknown.
Quality of Product (4/5)
Comment Helpful? Yes - 2 No - 0 Report
Response from
Barry W., Technical Support
Thanks for taking the time to let us know this is happening. When Mac OS X sleeps, the drive will dismount from the system as the OS sleeps. When the OS comes out of sleep mode, the drive should remount before the system is ready to interact with. This enclosure, and others should act in this fashion on an Apple OS X version. We tried to reach you by email, but were unsuccessful. We would still like to assist you. Please contact us at 1-800-265-1844 or email us at