Want to resolve partition failed error on Mac OS X? If you tried partitioning drive in Mac then it might may be possible that you may receive “partition failed” alert message along with “Couldn’t modify partition map because file system verification failed" error sometimes. By the way to resolve the issue check file system in command line at single user mode after reboot. After that bin/fsck -fy command be typed in command prompt. After completion of fsck you need to type”exit” or system should be reboot.