i have 4 extra hard drives: 2 x 300 GB, 2 x 80 GB. right now 3 of them are in enclosures. one of the 80 GB ones are in an enclosure and holds my powerbook's itunes library. i made one of the 300 GB my startup drive of my intel iMac just for fun really. the other 300 GB has backup stuff and my iMac's itunes library. the other 80 is not being used at the moment. also, is there any way 2 computers can share the same itunes library at the same time? what about 2 different users on the same computer?