On Nov 27, 2007, at 1:58 PM, g4-request at listserver.themacintoshguy.com wrote: > You can mount the 750 drive in any location that you want. Once a > drive is designated as the "startup" drive, it will be used as such > until you select and designate a different drive for that purpose. The above is true but I would put it in the rear tray as that buss is faster. However, my G4 MDD dual processor has two busses for the hard drives, yours may also. The rear tray (2 drives) is ATA/100 and the forward bay is ATA/66. If you put the main drive in the front bay you will see it being a little slower. I have two Seagate 150gig drives in the rear bay (master (Leopard) and slave (Tiger) selected) and the original 80gig ((Panther) master) in the front bay. This configuration works well. My Leopard drive used to be my backup drive so better get another one or a new machine ;-)) Also you might want to look into "cable select" as that might be a better option.