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Message: <blockquote data-quote="pm-r" data-source="post: 1653702" data-attributes="member: 175845">I used to use similar settings and possibly a hangover from the days when the maintenance cron jobs wouldn't run if the Mac was in sleep mode. But then I discovered that things changed starting with SL 10.6.x I believe, that the some of maintenance tasks changed to run on wakeup, and they changed even further with the later OS X versions. Now they're not even cron jobs but called something else I believe that my old brain forgets at the moment.And yes, I'm very aware that the startup of any HDD is quite hard on them, so there should be a good compromise somewhere, or just let them keep spinning.But even when set to keep spinning in any preferences, the OS still seems to put most HDDs into a sleep mode if left unused for some length of time. And the data and info seems hard to find what actually is going on.</blockquote>