How to unmount external HDD automatically on USB 3.0 port ?

Hi All,
Could anybody help me? I use my MBP on battery power usually and have an external HDD. I gave 10 min. to go sleep. Sometimes I have to leave alone my mac e.g. for a long call or manage something. When I come back my machine is sleeping... after wake up I got an alert about unmounting, should formatting external HDD, because can't read it so on... Is any possibility (automator setting?) to unmount automatically before go sleep? I've read the community's discussion but haven't found a real solution. I think it is not lifelike to look at it very attentively during you do 1000 other things and if the unmounting is so important for OS. I trust there is a simple solution maybe you know it.
Thanks,
Zack

From my point of few its not HDD problem because the HDD works in connection with USB 2.0 port.
Im wondering if you already tried to update the USB 3.0 driver.
Did you try this HDD in connection with another computers / USB 3.0 ports?
I think its worth a check.
Furthermore I read about some USB 3.0 controller problems from different manufacturers.
Sometimes it could be possible that some compatibility problems between different devices may arise.

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