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18 Jun 2012  
Golden
Microsoft MVP

Windows 7 Ult. x64
 
 

Hi,

I've seen this behaviour before on a friends Gigabyte motherboard sporting Etron drivers. I haven't yet tried all the fixes suggested below, as he was happy to use the USB2.0 ports instead:

The mysterious case of the dissapearing USB3 external drives ...

Are you on the latest drivers/BIOS?

Regards,
Golden
My System SpecsSystem Spec