Backstory: Photoshop was merging a huge panorama, I slept the machine, woke it up. Few mins later warnings about no space on boot volume. Force Quit Photoshop and I end up 63Gb down on space! It's a 160Gb Intel G2, it should have 85+GB free. It says currently it's 17... This is what terminal says it all is: sudo du -hs /* 11G /Applications 9.3G /Developer 5.4G /Library 0B /Network 2.3G /System 8.0K /TheVolumeSettingsFolder 42G /Users = 70Gb used That does not add up to the 152Gb of data I apparently have Grand Perspective doesn't show this mega file and erase free space just fills the 17Gb of stuff. Any ideas?