I was backing up some files to DVD (~4.1GB) and I thought it would be easier if I could just create a .dmg file of the ones I wanted to back up and drag that into disk utility, I found a program called DMG Tool and I chose the folders I wanted to copy into the new disk image. About halfway through I changed my mind and tried to cancel the copying, nothing, so I just force quit the app, when scrolling through my finder window, I noticed that my available disk space was gradually decreasing, so I waited until it stopped decreasing and looked for the ~4GB. Nothing! I tried again doing the same thing to try and source the files, I let it finish and I ejected the created image. But I have no files to show for it and now I have ~8GB missing. My 'Macintosh HD' says I have 90.55 GB remaining, however the sum of the folders within 'Macintosh HD' would indicate that I have ~99 GB remaining. I've searched for files modified today under every letter and number and I still can't account for the discrepancy. I ran disk utility and I as told my disk was in need of repair, so I started up Mac OS X from the install disc and repaired it, everything was repaired. I've also verified and repaired permissions aswell as verifying the disk after the repair and it says everything is fine. Apart from the obvious 're-install Mac OS X' is there any way I can resolve this problem?