Hi, My iTunes collection has nearly filled up the 80GB drive in my Mac mini, so I'm thinking of buying an external 320GB drive and moving all the music onto that. In order to create a backup I'd want to be able to attach a second 320GB drive from time to time. I have a strong preference for bus-powered drives since I don't like the clutter of cables and power adapters. But would two bus-powered drives work with the Mac mini? Maybe one attached to a USB port and the other to the Firewire port? This is an original PPC mini by the way. Thanks in advance for any advice!