>The new drive is not SCSI ( Link to Drive: >http://eshop.macsales.com/item/Seagate/ST3750640A/ ). >My G4 simply came with the two ATA drives in the rear >tray, then I added the new ATA drive in the front tray. Well, could that be your problem? It's a serial ATA! Do you have an SATA card installed? Also, I think that "front tray" interface is slower than the "rear tray". When you buy faster ATA drives, your system performance might be better if you keep the system files on the faster interface.