I have a qps 7k 80 gig hd and it works with the g3 os9 and my power book 10.3.6 but it wont mount on the g5 is there any reason. It sorta showed up. one time. I tried both fw front and back. 2 different cords. I need to figure this out. It wont show up in the system profiler and when I did try to format it only gave me a unix option which failed any how. 1.8ghz g5 10.3.6 1.5 gigs of ram.