I just got my first Mac, a 17" MBP with a 160GB drive, and just got two 500GB drives, both USB (no firewire, but I couldn't pass up the price). I was wondering what the best way was to set these up. I planned on using one just for backup, and the other for media and miscellaneous. I don't think I will need my windows machines to access these drives. So, is there any reason to partition these drives? I was assuming to reformat them to, I believe, HFS with journal? Finally, I was reading about a scratch disk. Is this something that I should set up while doing this? Thanks for the help on this.