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I have a late 2012 Mac Mini running OSX 10.8.2. My iTunes library lives on an external Seagate drive, which has its own power supply. When my Mac Mini goes to sleep it will frequently wake up with the familiar message"

The disk was not ejected properly. If possible, always eject a disk before unplugging it or turning it off.

After looking around on various forums I have tried turning off the "put hard disks to sleep when possible". This seemed to make the problem occur less often but it still occurs.

The only way to fix seems to be to reboot the Mini.

Is there a way to stop this or to auto-reconnect the drive when it wakes from sleep?

This problem coupled with the fact that half the time the Mini won't wake up at all is really bugging me! My MBP works great, but the Mini is a pain!

The disc is a Seagate STBV2000200 Expansion Desktop.

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I have the same issue, but I'm using an external OWC SSD. –  Ben Scheirman Mar 20 '13 at 12:25
My sleep problem seems to have gone away since updating to OSX 10.8.3. Thanks Apple, that was driving me nuts! –  rf_wilson Mar 26 '13 at 14:21

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