USB 1, 12 Mbps USB 2, 480 Mbps Firewire, 400 Mbps Firewire 800, 800 Mbps To use USB 2 of firewire 800 you will need to buy an add on PCI card. Brian G4 gigE 1.0 GHz Powerlogix, 1 GB RAM On Oct 15, 2007, at 9:51 AM, O'Brien wrote: >>> 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 > _______________________________________________ > G4 mailing list > G4 at listserver.themacintoshguy.com > http://listserver.themacintoshguy.com/mailman/listinfo/g4