I just picked up a SimpleTech 500GB external HD. 7200 rpm. Connected it to my new imac using USB port on back. The hard drive has it's own power supply. I have Time Machine backing up my entire computer right now. It's been hooked up for an hour and a half and only 1.75GB have transferred so far. Is it just me, or is this incredibly slow? Any ideas or suggestions? HD does not have firewire. Only USB 2.0.