I'm going to purchase an external Hard Drive for my iBook. I've never used one before and would appricate some advice about the best way to set it up? My plan is to have 1 partition of 60GB to mirror my HD and the rest to store Music, Photos, Movies etc and have iTunes, iPhoto etc access them from the external. What I need to know is how to make that set up. I understand I use Disk Utility to make the partitions but i'm a little unsure about the rest of it. Do I need to install my OS on to it? If so how do I do that? Anything else I should consider when setting it up? Thanks in advance.