I was rendering a few nights ago and left my mac on while I slept. When I woke up my dad had turned off the mac so I turned it back on to find that seemingly random files on my hard drive would disappear when I clicked them. I had to go to school in 20 minutes so I went into single user mode and tried some fsck -y. Found maybe 50 errors and got a bus error. I went to school and came home to try Diskwarrior, it found 300 over written files. I clicked to repair and it crashed at the last moment when it was repairing. I left it for that night and decided to try it the next day. Found 600 files and died (This was running DW off panther, I then reinstalled 10.2 for a last test). At this point I did a hardware check which turned out fine. Finally I left it on last night and DW found 1,200 files over written. I clicked repair and it took about 4 hours to fix and it finally repaired it. I have a few corrupted programs such as safari and cinema 4d, but apart from that all is well. Get Disk warrior, it REALLY does work, and I don't work for Alsoft.