Is it possible to install a 4th internal ATA HD in my Power Mac G4? It is a 400 MHZ AGP Power Mac with a 1.4 Ghz G4 upgrade. I currently have the original 20BG HD it shipped with, and a 60 and 120 GB HD as well inside. I just bought a 200GB HD for $99 and want them all in there. I currently have a DVD rom drive and an internal Zip Drive. Any suggestions? Thanks in advance. Dimitri S.