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jeff-milw on 2010-03-11Using PMSET on Mac OS X, you can prevent your external hardrive from going to sleep (or spinning down). If you rock a notebook, and rely on an external enclosure, you probably know how annoying it is when your drive goes to sleep on you and it takes a good 30 seconds for it to spin back up again. More annoying is when Finder becomes unresponsive until this happens. If your drive is set to spindown every 15 minutes, then this ends up being downright maddening, and seriously cripples your workflow.