It might actually be a better idea to turn off the "Let hard disks sleep" option. I heard somewhere (don't quote me on this) that most of the wear on hard drives occurs while they're either spinning up or spinning down, much like a car engine. Also, in my experience, OS X doesn't need a very long idle period to put the disk to sleep. I'd like to be able to set it to, say, 45 minutes to an hour, but OS X seems to put it to sleep after less than five minutes, so it's always spinning down just as I'm ready to start accessing the disk again. There's an annoying pause whenever this happens.
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