I recently bought an 12 inch 1 ghz G4 iBook through my school bookstore (paid $599 for it) and I absolutely love it. However I was wondering if I do a hard drive upgrade to it, can I use any type of laptop hard drive or are there specific ones that work with macs. I'm used to doing pc upgrades but when it comes to macs, I'm clueless. Also since I'm here on my hard drive I have two things that I'm not sure I even need. I'm using OSX that came with my system but I have two folders, one called "applications (OS 9)" and another that says system folder with the number 9 on the folder icon. Do I even need these or are they just a waist of space on my iBook? If I dont need them do I just drag both folders to my garbage can? Thanks!