As someone else mentioned, you'll need an ATA controller card. Sonnet, SIIG, and Acard are two brands that I know of. I bought a SIIG to add a third drive to my G4 400 AGP & didn't need any additional cables or parts. Installation of card and drive was a very quick & easy process, and if I want to add a fourth drive I'll be able to drop it right in. -Sandy >I have an 867 MHz G4 with two ATA Utra Hard Drives installed. I just >purchased a Maxtor 120GB and can't seem to find any information in the in >the installation section of the G4 manual on installing a third ATA hard >drive. Can anyone suggest a solution.