How to use Disk Utility:

• Netboot the machine.
• Open Disk Utility via the icon on the dock.
• Highlight the name of the local hard drive on the menu on the left of the screen.

• Click the Repair Disk button on the bottom right corner of the screen and let the program run until it finishes.
• If there is an error and it cannot fix the hard drive for some reason, run DiskWarrior then try running DiskUtility again.

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