I have a misbehaving hard drive that turns itself off when it detects my Mac is asleep. This is bad since OS X doesn't unmount the drive, so I get a nasty error message when the machine wakes up. Is there a way to automatically unmount the drive when the machine goes to sleep?

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I wonder if this is related to the problem I have here: superuser.com/questions/7996/… Will give the answer below a try and report back. – Darren Greaves Jul 18 '09 at 18:06
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up vote 3 down vote accepted

SleepWatcher by Bernhard Baehr seems to be what you are looking for.

Full instructions on how to set it up are available on MacOSXHints.com

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