My main system is bootable but disk utility says it needs to be repaired.
I can start disk utility from Live-USB which can verify my OS X partition but gives errors on checking the whole disk. The error is "unknown file system" - but it appears only after it found the main file system.
I guess my (hidden) recovery partition might be broken, since I cannot boot into it. Maybe this is the cause for disk utility to bring the error.
I would like to repair the recovery partition or at least delete it. I know there are tutorials of how to create a new one.