>> Can I use a USB2 external HD with an 800mHz Quicksilver / OSX.4.8? > On Mon, 15 Oct 2007 11:05:46 -0400, wilkinw wrote: > Sure, just doesn't run as USB 2 speeds. > On Oct 15, 2007, at 10:01 AM, O'Brien wrote: > OK...Thanks. About how slow is USB compared to USB2 or Firewire? (Just a rough idea if this is possible to answer) I want to add an external HD just for backup of 200-300 Gigs. I thought I might just get a USB HD because they're so much cheaper than Firewire. I don't think the transfer speed is a big issue because I'd be doing the backup while I'm not otherwise using the Mac. Does this seem reasonable? . . . . . . . . . . . . . . . . . . . . . . O'Brien