Hi all, I'm in need of some additional HD space for media (and really an entirely new computer, but don't have the money), and I was considering buying a 500GB Western Digital USB Passport drive. I noticed that in some reviews, however, that Powerbook G4s can have trouble powering these hard drives via the USB port. I have a 1.42GHz iBook G4... does anyone have experience using a bus-powered USB hard drive on a similar laptop? Am I okay to buy? Thanks!