Repair Mac Disk with fsck in Single User Mode

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Using Disk Utility through recovery mode is the preferred and most important disk repair tool on Mac platform, but if Disk Utility is not available or unable to repair a disk then the mode is single user and the fsck command line utility your next choice.

The fsck tool comes bundled with every Mac, but because it can only be accessed from the command line, it can seem complex and sound intimidating than it actually is. Fear not though, as using fsck is actually quite simple, and there are several instances when it can fix a problem with a drive that Disk Utility couldn’t.

How to use the Single User Mode and fsck to repair a disk

  1. Boot the Mac in single user through mode Hold down Command + S during system startup after hearing the startup chime you will know you have successfully entered single user mode because you will see a lot of white text scrolling by on a black background
  2. When the single user boot sequence is complete, you will find a small command prompt at the bottom of the screen preceded by a hash sign (#), when you see that, type exactly the following command:
  3. fsck -fy

  4. If fsck has completed and you see a ‘File system has been changed’ message, run ‘fsck -fy’ again until you see a message saying ‘The volume (name) appears to be okay’ – this is the standard procedure for using fsck
  5. Type “reboot” to exit single-user mode and restart the Mac as usual in OS X.

Once OS X has restarted, it may be a good idea to confirm that everything is okay by going back to Disk Utility and running the “Verify” tool to check the health of the disks.

Keep in mind that if the ‘fsck’ tool continuously fails or reports errors and Disk Utility also can’t be used, the hard drive itself may fail and be on its last legs, so make sure you have a backup.up Start. up all your critical data using Time Machine or your backup method of choice, and aim to have the drive replaced sooner rather than later.

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How to Repair a Mac Disk with fsck from Single User Mode: FAQ

Tutorial Summary: How to Repair a Mac Disk with fsck from Single User Mode

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What is actual time in which this method complete?

The time to complete the How to Repair a Mac Disk with fsck from Single User Mode tutorial is 10+ minutes.

What are the supported Device?

Apple

What are the supported Operating system?

mac OS


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