I ran SuperDuper last night and the backup failed with an unknown error. After, Spotlight didn't find files. I rebooted and at the login screen was given the error message 'backup disc full, delete some files' - problem is, OS X won't boot beyond the starfield screen, so there's no way of deleting files or running the system. I took the drive out and put it in a USB caddy on another machine and ran Disk Utility - it said repairs were needed, so I did this. However, putting it back into the MBP nothing has changed, it still won't boot and insists the disc is full - there is over 180GB free! (I can see this when I mount it on another machine.) Ideas?!