After 1.5 years of owning my non-intel G5 I have filled the 150gb hard drive to the top (only 8gb left). and can not delete any more! Can I go by "any" new 320gb HD, pop it in, copy the old hard drive to the new one... and then switch it's spots in the tower; re-boot and it work? or is it a little more complicated? Do i have to buy a Mac compatible HD? how can I use the new drive as the main drive? DO I need to use the new drive as a main drive? Am I asking to many questions?