I recently purchased a 1TB MyBook external drive. I am hooking it up to my airport extreme to use as a network drive. I am also thinking about attempting to use time machine wirelessly. If I can't or do not feel comfortable with the backups I'm getting (since wireless backups, other than time capsule, are not officially supported by Apple), I will probably just connect my laptop a few times a week to get a backup. The other space I will be using for my music collection, photos, movies, etc. That being said, I am looking for advise on how to format/partition the drive. From what i've read, I need to either format the entire drive as Mac Extended (journaled) or at least a partition of it in order to use time machine. If I do the entire drive, PC's will not be able to read the drive. Is that correct? My current HD that I would be backing up is 120GB. I may end up getting a bigger drive in the future...250GB. What would be a good size for the time machine partition? So if you just got a 1TB drive, and wanted to use part of it for time machine, and the other space for music/movies, how would you format it? Thanks!