Is it me, or does iDVD get very unstable when running low on hard drive space? When I say low I mean under 40 GB left on a 160 GB superdrive. In fact the whole system really slows down and crashes constantly when I go below 30 - 40 GB of space left. I just started noticing this yesterday after I installed Panther on my G5 and started doing some video capturing / editing. I dont know how much space I had before he install and video capture, it must have been more though. I'm kinda new to Apples. What kind of disk management, and maintenance options are there? I heard that defraging is not necessary. Is This true?