OK, I'll admit that it doesn't take much to confuse me, lol I clicked the apple at top left of the screen and then on System Preferences aver. My intention being to change the time interval between my inactivity and things stopping working on the laptop. But then I noticed a message at the bottom of the page with a sort of On/Off option. It said.......... "Put the hard disk(s) to sleep when possible" Any idea what that means? 10 minutes? An hour?