Friday, October 1, 2010

when the Disk utility fails- The volume 'Macintosh HD' needs to be repaired Error

While using the Logic studio on your Mac OS X, there occurred an error and the Logic studio application crashed. Thereafter, the colored wheel appeared on the screen and the system almost hangs out there unusually for several minutes. You rebooted the system and found the blank grey screen with a flashing question mark.

You plugged out the peripherals, such as external sound cards, printer, external modem etc and rebooted the system to find the flashing question mark again. All your data lies inside the Mac hard drive and the problem occurred so suddenly that you are quite clueless about the issue and have to think for some Mac recovery utility to recover back the data.

To your dismay, in the above situation, if you try to reboot your Mac system from the installation disk and try 'First Aid' from the Disk Utility in order to verify and repair, you may find the following errors subsequently:

'Verify and repair volume 'Macintosh HD'

the disk 'Macintosh HD' could not be unmounted”

“The volume 'Macintosh HD' needs to be repaired

Error:filesystem verify or repair failed”


Before cursing negligence and any such things, you must admit that there can be a number of reasons behind the issue, that you can count. It can be a bad RAM, bad sectors on the hard drive etc. Moreover, a system or application crash can sometimes corrupt the nvram or affect the journal or directory entries of the file system.


1. Try resetting the nvram and reselect the startup volume. The procedure changes certain system preferences like system volume, mouse speed settings etc.

2. If the the above measure fails and the Disk utility couldn't resolve the issue, then you are left with one choice to reinstall the operating system with the option Archive & Install.

3. If the the above also fails, it is the Erase & Install option that you have to opt for.

The Erase & Install option will wipe all the data from your Mac hard drive and you have to recover it from the backup. If you have not taken backup for for all your data or failed to restore from backup, then using a Data Recovery software Mac can do the better recovery.


  1. Thanks for the heads up. I once had a problem with my hard disk and since I have a data recovery tool I was able to get my files back up. nice post!
    Data Recovery

  2. If there is valuable data involved I would always avoid the Erase & Install. Hard Drives are too inexpensive to risk your data. You can reset your Parameter Ram on a by holding down the Option, Apple, the P and R keys at boot up. Listen for the Mac to restart 3 times before releasing the keys. If a software solution does not work to recover your data you will need to go to a Professional Mac Data Recovery company.