Fixed : OS X Yosemite "File System Verify or Repair failed"


When Mac users try to install OS X Yosemite, they getting error message like “OS X could not be installed on your computer”, “File system verify or repair failed”.

Reason for this problem:-

Apple added a basic disk check to the OS X  Yosemite installation process. If it find any error in your hard disk which is can’t be repaired it will refuse to install Mac OS X Yosemite.

Solution 1:-

  1. Restore your system from backup.
  2. Repair disk using disk utility.

Solution 2:- Check the RAM

Run memtest to check the RAM.

Replace the failure RAM with good one.

Also read Apple support guide about this error.

Solution 3:-

  1. Download Disk Warrior 4.4 using other computer.
  2. Put Diskwarrior on to a USB disk.
  3. Turn on MacBook Pro. When error popup, go to Utilities (top bar).
  4. Choose Disk Utility.
  5. Inset a USB disk on computer (with Disk warrior on it).
  6. Press on burn and insert blank DVD-R.
  7. Choose Diswarrior.cdr.
  8. Write on disk. Done.
  9. Restart computer and hold C key.
  10. Your Mac computer will boot from DVD and load Disk warrior.
  11. After Disk warrior started, choose rebuild. It will rebuild your directory.
  12. After it done restart your computer.

If you knew any other solutions, inform us via comment.

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