Well, I put Poser on the partitioned "D"drive, not the "C" and it has 16Gs on that scratch drive. Brand new machine, I dont' think it needs defrag yet. I really do think-- because there was some transferring from the shared files on "C" that it got confused. What confused me-- no place to tell Poser where it's scratch disk is????? Unless I'm overlooking something. It's eventually going on half of the 120G but this month is squeaking already. I do like XP so far. It holds my hand a little bit much, but that's Microsoft. Emily