I bought a Maxtor 3200 500GB external hard drive to store my movies and TV shows on. When I got it I erased it, and it now has one partition, an Mac OS Extended (Journaled). I've used about 100GB. What with Leaopard coming out, I'd like for it to have a backup partition for use with Time Machine. I'm also thinking of maybe putting a small partition there to play with Ubuntu. Is there a way I can repartition the drive, without losing the data already on there?