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CoolMax > 
Item#: N82E16817159121

COOLMAX HD-381BZ-U3 Aluminum 3.5" Copper SATA I/II USB 3.0 External Enclosure w/OTB Function

  • 3.5"
  • Aluminum
  • USB 3.0
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Learn more about the CoolMax HD-381BZ-U3




AC Adapter
Internal Interface
External Interface
USB 3.0
Maximum Capacity (per Bay)
Up to 2TB
Transfer Rate: USB3.0 up to 5Gbps / USB2.0 up to 480Mbps

HDD: 3.5" SATA I/II Hard Disk Drives up to 2TB

System Required: Windows XP / Vista / 7 (32/64-bit)

Power Adapter: AC input 100-240V; DC Output 12V
10 times faster than USB 2.0

Backwards compatible with USB 2.0/ 1.1

Supports most 3.5" SATA I/II hard drive, SATA 6Gb/s drives

Power and HDD Activity LED lights

With one-touch backup function

Hot swap, Plug and Play

Aluminum casing for heat dissipation

Compliant with USB3.0 Specification Revision 1.0

Compliant with USB Specification Revision 2.0

Support USB Super-Speed, High-Speed and Full-Speed Operation

Bus bandwidth of USB up to 5Gbps

Secured PCB Mount of USB 3.0 interface for Durability

Compliance with Serial ATA Specification Revision 2.6

Dimensions & Weight

7.50" x 1.20" x 4.30"
0.75 lbs.

Manufacturer Warranty

1 year limited
1 year limited

Quick Info


  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year

Customer Reviews of the CoolMax HD-381BZ-U3

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  • James D.
  • 11/13/2014 7:34:47 PM
  • Tech Level: Somewhat High
  • Ownership: less than 1 day
  • Verified Owner

1 out of 5 eggsPAID MORE Got Less

Pros: The electronics do work. I paid double what the cheap cases are to get a "good one".

Cons: arrived with one corner of the case flattened into a point instead of the square shape to accept a 3.5 drive.

Also the power transformer cover was not attached.

Other Thoughts: I NEEDED this case to offload some files from a work computer with an almost full hard drive. NO time for a RMA

So, I bent the misshapen aluminum case into the rectangle it should have been, I glued the transformer together, I'll live with the cracked plastic front plate and I used it.

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  • John F.
  • 11/17/2012 8:28:43 AM
  • Tech Level: Average
  • Ownership: less than 1 day
  • Verified Owner

5 out of 5 eggsit is very fast

Pros: very fast, this is from NTI Analyzer:
ill) SAMSUNG HD103SJ USB Device
97.33 MB/S
187.50 MB/S
83.08 MB/S
187.50 MB/S

Cons: small con. there is no instruction sheet and you can't download one from their site(404 error)
there are two countersink tabs to make the drive snug in the case. but the screws are pan head. I fiddled and found an orientation that worked, but a sketch on the box would have been nice.

Other Thoughts: it is only 4.17 times as fast as my USB 2.0 enclosure was but it is 1.5 times as fast as my external USB 3.0 drive...which is powered by the USB port instead of plugged in.
anyway, I will buy another for my other drive I use as an external for porting data. nice improvement in my life

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  • estphanous r.
  • 10/4/2012 6:46:40 PM
  • Tech Level: Average
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsworks well so far

Pros: The enclosure has some vents to let heat escape, but it doesn't have active cooling. The case is made of aluminum which I hope acts as a heatsink for the hard drive. Comes with a USB cable!

Cons: Not really a con, but since this item doesn't have a fan, I would suggest pairing it with a low-temperature drive like the Western Digital Green series. Those WD Green drives operate at a lower rotational speed, but that's OK in this application because your bottleneck will be the USB interface and not the drive's specs.

Other Thoughts: I got the impression from the picture that the case was a woodgrain design, but in fact it looks like copper. In any case the appearance of the item doesn't matter because it's installed in the server room where no one ever sees it.

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Item#: N82E16817159121
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