I just got a new Macbook 1.83ghz, and it says it has a 60gig drive, but when I have last checked my memory, it said I only have 40gigs, as of now, I have 30, but I put my music and stuff on. But, my question is, does it really take 20gigs for OSX? I mean, windows doesn't even take up but 3gigs, what is up wit this?