You can then restore your backup data using the Migration Assistant. If repairs aren't successful: As long as you have a backup of the data stored on the affected drive, reformat the drive and perform a clean installation of your operating system version.However, don't give up try rerunning the repair a few times. If First Aid reports a failure: 'The underlying task reported failure' message indicates that it failed at making the needed repair.If you must have the file, then check your backup for a usable copy. Select Unlock volume name from the File menu. If you don't need the file, or you can delete the file and easily recreate it. When done, restart you Mac in Recovery mode (CMD-R) as described at the beginning of this article. You can examine the files in the DamagedFiles folder.More than likely, both files have become corrupt, but there's a slight chance you can recover one or both of them. Before running the RemoveNortonMacFiles tool, make sure that you have. The overlapped error indicates that two (or possibly more) files occupied the same location on the drive receiving repair. If the problem persists, remove and reinstall Norton device security product for Mac. If First Aid displays an 'overlapped extent allocation' error: Disk Utility will create a DamagedFiles folder at the root level of your startup drive.In some previous versions of First Aid, it was necessary to run the repair process multiple times to ensure the repairs were complete that is no longer required. If First Aid reports no issues: If First Aid indicates that the drive appears to be okay or that repairs are complete, you're done.

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