whoops, sorry, the standard is 4200 and i meant ibook, not imac. Good point about external drive, unfortunatly though, since its an ibook, i will be using the only firewire slot for an interface...maybe i could daisy chain it? The reason I have so many questions is because i don't have the ibook and interface yet, which means i can't experiment. I wanted to do some research on it before i commit.