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USB2 only transfering 12mbs

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#1 noz03


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Posted 02 August 2016 - 07:39 AM

I am transfering a large amount of data from 1 external HD to another, they are both USB2.0 and my PC is also USB2.0 so according to google it should transfer at upto 57mbs, or an average of around 30-40mbs, but I am only getting 12mbs... Any ideas what could be going wrong?

I am using windows 7 on a Dell optiplex775. Both memory and CPU are around 50% while transfering so I don't think that is the problem. The hard drives are 1tb seagate USB3.0 and a 640gb laptop harddrive in a USB2.0 external case.


Anyone have any suggestions? I have already tried different usb ports from around my PC and all seem to get the same speed.




I just tried copying a 1gb file from my internal to the externals / visa versa and the speeds are around double. I also tried on a different laptop from external to external and same halved speed. So I am guessing this is just normal that a PC using 2 USB2.0s at the same time can only opperate at half speed? Is there any way around it? I've tried using USB ports at opposite ends of my PC (I have 2 on the front, and 2+4 on the back) but same problem.

Edited by noz03, 02 August 2016 - 08:14 AM.

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#2 JohnC_21


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Posted 02 August 2016 - 09:27 AM

There is a good explanation here.



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