OK, so I'm getting kinda ahead of myself here, but I have a question about the external drive that I have not yet bought for the MacBook that I do not yet have. When I eventually get this external drive (I'm thinking of going with 1 TB), how would I partition it so that half of the drive is used as normal and the other half is used for Time Machine backups? I have absolutely no experience with partitioning whatsoever (I'm planning on virtualizing XP on the MacBook), which is why I'm asking this noob-ish question. Or is that even necessary? Can I use it for both at the same time?