When I put my macbook to sleep, my external hard drive goes to sleep also, i.e.- it spools down, and all lights go off. No problem there. However, when I do a full shut down my macbook down, the external hard drive stays on, spooled up and powered? Any ideas on why this is? What does sleep do that shut down doesn't? Or is it an issue with my external hard drive (Buffalo 1TB USB) I rarely shut my macbook down so it's not usually and issue but still gets quite annoying when I need to do a full "shut down" for some reason and return hours/days later to find the external drive still whirring away.