Mac Mini auto disconnects external drives

Disconnects external drives using USB 3.0 drives were attached to Windows XP machine drives have no password/lock.  Genius Bar tried as well same results, tried using new MacBook Pro same result suspect software OS X issue looking for work around to transfer data/pictues etc. to new Mac Mini?

I have a late 2012 Mac Mini with 10.9.2 and use a WD drive in a Macally enclosure running on the USB3 port and have no issues.  The drive sleeps when the Mac sleeps but stays on when the Mac shuts down (some Mavericks issue I guess).  Not sure why your drive would disconnect.  Do you have the setting to not piut hard drive to sleep?  Not sure this would fix anything or not for you.

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