I need some information on where I can get a new hard drive for my wife's desktop Mac. It is a 733mhz G4, and the original drive is just about dead. It originally had a 40gb drive but she wants to take this opportunity to get a bigger one, around an 80gb drive. I know it needs to be an ATA, but does it have to be an Ultra ATA? Who sells the proper drives? Are there drives i can stick in there but would not boot the computer, therefore being drives I need to not buy?