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Published on Oct 1, 2012
Known problem fixes here:
"Couldn't modify partition map because file system verification failed" 1. Restart your mac and as soon as it restarts, hold down "Command & S" 2. Enter this:
/sbin/fsck -fy
3. When fsck is complete, type “exit” or “reboot” to reboot. 4. Boot the Mac as usual, verify the disk again in Disk Utility, and partition as usual
Thanks to YouTubers victor riena & Shawn Caesar for this info