Somehow my harddrive seems to fail, I am not able to startup anymore. When I started in verbose mode, I noticed that the harddrive return I/O Errors and the B-Node-Tree seems to be corrupted.
I was able to use the single-user mode to backup files to an external harddrive, but when I tried to repartition the harddrive from the recovery mode, after failing to repair the partitions in single-user mode, I get an error, that he is unable to unmount the drive.
(DiskWarrior 4.4 doesn't even recognize the Macintosh HD and the S.M.A.R.T Test results are alright)
I first thought maybe something is actually used on that drive, but even after trying to repartition from the Disk Utility on a Mac OSX Lion Installer DVD, he keeps telling me, that he is unable to unmount the drive.
(I had a bootcamp partition on the harddrive as well, that is still highlighted, so that seems to be the issue)
The system is an early 2011 MBP.