My 2010 Mac Pro has been running smooth and performance is impressive. After my fresh install of OSX 10.6.4, and installing my apps, my boot drive was only using 19.5GB of space. This was verified in Disk Utility, and the numbers in the image below add up to the same amount. Out of nowhere this morning I see that it is now taking up 60GB worth of space. I'm trying to find out where it went, and what is taking up all that space. I'm looking for an app that scans the drive and can show me files/folders where all the data is sitting. I did a quick "get info" on each of the folders on my boot drive and the following is what I get: Anyone have a recommended app, or know what might have gone on? No System Software updates, it might have gone to sleep but I doubt the sleep image is 40GB. Scratching my head here . . .