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Thread: took Macbook Pro 10 hours to copy a 3TB drive to another 3TB drive, is that normal?
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Old Feb 13, 2016, 2:34 pm
  #4  
deniah
 
Join Date: Jul 2008
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Originally Posted by gfunkdave
Well, at full theoretical USB 3.0 speed of 5Gbps (625 MB/s) it should take a little over an hour. But I don't think any consumer laptop can pull full theoretical speeds.
more the problem of the drive, than the laptop (=usb controller and other)

top usb drives can do a sustained 100MB/s ...though ive never seen such. usually 60-80MB/s is what im happy to see whether in a usb stick, powered, or standalone 2.5/3.5" drive.

with that in mind, 3 terabytes at 80MB/s equates to a neat 10.5 hours

http://www.everythingusb.com/speed.html
(see the 3.5" section)
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