Mac OS X (10.6, 10.7, 10.8) Disk Utility repair failed

If Disk Utility is unable to repair hard drive, then try booting from any install DVD or USB drive. Then open terminal from the Utilities menu.

When terminal opens, type:
fsck_hfs -rf /dev/disk0s2

Your disk partition may be called something other than ‘disk0s2’. This process may take 10-15 minutes, but is more powerful than the regular Disk Utility repair option.

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