First off, this is not something that Omni Sweeper or Disk Inventory X can help with -- my files aren't the problem. My hard drive got pretty full, so I decided to replace it with a new one. Unfortunately, the clone of my original drive got corrupted so I had to put the original drive back in to the computer almost immediately after I took it out. Somehow, while it was outside of my computer, the amount of space that I was using on it went up from 87 GB to 133 GB. Of course, the only external drive that I can use to clone it is 120 GB, so I need to figure out what's using this extra space. Oddly, Disk Inventory X still insists that I'm only using 87 GB of space, and the results of du -k | sort -nr agrees with that result. Does anyone have a way of getting rid of the space that OS X believes that I'm using?