Is there a way to prevent OSX from spinning up the external HD's even though I am not accessing it. Reason I am asking is because it seems that every time I leave my iMac alone for a while (sleep mode is not active btw) the external HD's spin down, and anything that I try to open (Safari, iPhoto, Firefox, etc..) the stupid external HD's have to spin up first (beach ball for a few seconds) then the program fires up. Is there any way of stopping this behavior. I am on SL btw but this also happened in 10.5. I have 3 1TB externals 1 USB 2 Firewire.