Hello, Tomorrow I'm getting my very first mac (macbook 2.2), and I have purchased an external harddrive to go with it (http://store.apple.com/1-800-MY-APP.../RSLID?mco=85A10F4B&fnode=home&nplm=TP946LL/A) for a very nice price. Now, I want to take about 200GB For Time machine and 300GB for extra storage. Can someone tell me, first of all, is 200GB a reasonable number for Time machine? Second, how do I partition a harddrive under a mac? I have absolutely no idea right now! Thanks!