I did as suggested and found this G4-450 AGP has ATA-4's. I currently have a 20 GB and 40 GB Hard Drives installed. Does that mean the the Max I can use is a 60 GB and 60GB or can I go up to 120 GB and 120 GB? The reason for asking is I use one drive as a primary and the other as a secondary or backup drive. I use CCC to backup the primary to the secondary and was thinking bout getting two 120 GB drives. The 120 barrier is confusing. Dick On 5/4/04 7:13 AM, "Power Macintosh G4 List" <G4 at lists.themacintoshguy.com> wrote: > From: Jim Pacyga <jim.pacyga at earthlink.net> > Subject: Re: [G4] posting, please? > Date: Mon, 3 May 2004 22:11:01 -0700 > > Go into the System Profiler (hopefully you have OS X 10.3). If you go > under the Hardware->ATA section on the left hand nav bar, you will get > the ATA device tree.