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OS X: Partition or Resizing Error / Partition failed with the error: Couldn’t modify partition map because file system verification failed.

Shutdown

Start system into Single User Mode by holding Command+S during boot

At the command prompt, type:
/sbin/fsck -fy then ENTER

When fsck is complete, type “exit” to restart

Start system and verify disk using Disk Utility

Uninstall OS X EnterpriseDB PostgreSQL 9.1

Open a terminal window via Applications->Utilities->Terminal 

open /Library/PostgreSQL/9.1/uninstall-postgresql.app
sudo rm -rf /Library/PostgreSQL 
sudo rm /etc/postgres-reg.ini

Open User & Groups via System Preferences -> Users & Groups and delete PostgreSQL user