I have a little over 20 gigs free on my PB. I've been ripping DVDs for encoding. I'm in the middle of ripping a season of Chappelle's Show. Each episode is about 1 gig. In the middle of ripping an episode and OS X warns me that I have low disk space. I check and I'm at 200 megs. Then MacTheRipper crashes and I'm back up over 20 gigs. Weird. So what happens when OS X gets low? Anything other than a warning? Or does it try to make space somehow?