I have a PowerBook G4. The hard drive is an 80GB. I have roughly 54GB tied up with iTunes. I've gotten one error message that says my start up disk is almost full. When I'm looking at the macintosh (my harddrive window) it says I've got 2.7GB free space. I don't have any movies stored. I don't have any games. I mostly use my mac for surfing the internet and music. I've made a few (maybe four at the most) ringtones using Garageband. So I don't have a lot of space tied up there. Where did the rest of my free space go? I'm used to using a PC and trying to figure this along with some other minor stuff out is giving me a bit of a fit. I've downloaded the WhatSize program, but it doesn't make much sense to me. Have I truly used more than 54BG of space with iTunes and I just don't know it or do I have a bunch of files saved somewhere that I don't know about? Yes, I've backed up my music library onto an external drive so I'm not really worried about losing my music. TIA for any and all help you pros can provide.