Hello guys, I have a mid 2009 MacBook Pro (13 inch) 2.53 GHz (Core 2 Duo) with 4 GB RAM. I have a problem- I am sure that I have only used about 15GB space. I have no apps above 1GB. I also have a BootCamp partition. When I click on my OSX (Snow Leopard 10.6) partition (Macintosh HD), the capacity shown is 215GB and remaining is 158GB. About 40GB space just vanished! I used OmniDiskSweeper. The results were that there was 34.1GB being used in Users>.Tusing>Tusing.sparsebundle>bands. In "bands", there are hundreds of 8MB files. What should I do with them? Are they important? Can I delete them? Thank you for your help. I am new to this site. If you do not have an answer, please bump this thread (if thats possible in this forum). UPDATE: I can't see the hidden files in Finder, so should I use defaults write com.apple.finder AppleShowAllFiles -bool true to see them? UPDATE: I will keep FileVault on. Thanks for the help!