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. If First Aid reports that the drive appears to be OK, or that the drive has been repaired, you’re done.
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 displays an “overlapped extent allocation” error, Disk Utility will create a DamagedFiles folder at the root level of your startup drive. The overlapped error indicates that two (or possibly more) files occupied the same location on the drive being repaired. More than likely both files have become corrupt, but there's a small chance you can recover one or both of them. You can examine the files in the DamagedFiles folder. If you don’t need the file, or you can easily recreate it, I highly recommend just deleting the file. If you must have the file, then for a usable copy.
If First Aid reports, “The underlying task reported failure,” this indicates First Aid failed at making the needed repair. However, don’t give up; try rerunning the repair a few times.