I got a hold of a 20gig ATA hard drive to add to my G4 2x500 machine. I already have a 40 gig, which I partitioned when I replaced the original hard drive that crapped the bed. I put this second hard drive in as a slave. The computer sees it and gives me the stats and all for it, but it will not erase it no matter what I try. I got it from my someone who pulled it out of a PC, but it should work. I think it is a western digital and it looks just like the one in the machine now. Any help would be great....I need this second hard drive. Thanks!