I've noticed in the last few days that my remaining hard drive capacity in the finder is fluctuating dramatically. So much so that the operating system has occasionally altered me to the fact that I only have a few hundred mb available. When this has happened I have deleted a few files and upon emptying the trash I find my disk usage starts to reduce again. Over the next few hours it slowly starts showing 2.xgb, 5.xgb, 9.xgb, etc up until 20.xgb (which is around what I believe to be accurate). Once the finder reports this number it starts to slowly decrease again. I've repaired permissions and run a disk verification and everything came back fine. I've not installed any applications requesting passwords, etc many months and doubt that it would be a virus anyway? Any ideas? edit: running on a macbook pro 2.2GHz Core 2. 2GB memory.