I'm about to buy an external HD (500GBwith 2 FW400) for my iMac and MBP. 1) I do a lot of DVD ripping/encoding at the same time on both macs, is it possible to write on the HD the output of the 2 Machines at the same time? If yes, how fast would it be? 2) Can I store my iTunes/iPhoto library on the External HD and just link from the computers? Thanks!