I have a total of 7 USB Drives for my mac pro, all Western Digital My Books. These have accumulated over the last couple years (they're used to store video footage -- I archive just about everything I shoot), and as I've added more drives, I've found that each drive seems to slow down the computer a bit. Often, when editing or trying to save/open a file, the computer will freeze up (spinning beach ball) for a few seconds -- the exact length of time varies. I'm suspecting that the problem I'm facing is that each My Book is spinning down after a few minutes of inactivity. With 3 or more My Books connected at any given time, there's a good chance that at least one of those drives will spin down after a few minutes -- so when I try to play a clip, it will have to spin back up. (The same when I'm using a save/load dialog -- the computer accesses all the drives, so if any have spun down it freezes up) From what I've read, the energy saving "spin down" feature can't be disabled on the My Books, so I have a couple questions for anyone who might be able to answer. First -- does my suspicion that the My Books spinning down are slowing the computer down sound correct, or can anyone think of anything else that might be causing the problem? (Has anyone else run into similar problems?) Second -- can anyone recommend another method of storage that would allow me to avoid this "spin down" problem? Would another brand of drive solve the problem? Do I need a RAID? Ideally, I'd like to have all my footage drives connected at once without running into this "freezing" problem. Thanks in advance for any help you can provide!