I'd like to partition my external HD into two parts: one for Time Machine and one for storing photos and other files so I can free up some space on my internal HD. I've been using it out of the box for Time Machine for about a month now. I'm just wondering if I can partition it as it is with the backups on it already or do I have to wipe it clean, partition it, then start over with Time Machine? I would just like a 200 GB partition for Time Machine and the rest for storing data. Also, Disk Utility is a little confusing. It has my external HD in there and then there is a "sub drive" (not sure the technical name.. sorry) under that? That's just drive that Time Machine made more or less? And every time I partition it, there will be a "sub drive" for each partition?