


'file system check exit code is 8' indicates a corrupt file system was found during a check, it is caused by a sudden power failure, virus attack, catalog file corruption, invalid volume header and much more. Updated by Tim to Mac Data Recovery Tips on September 18th, 2020 To use it, click the First Aid button on the left side of the Disk Utility window. Use First Aid to verify and (if necessary) repair an ailing drive. If you suspect that something’s not quite right with your Mac, the First Aid portion of Disk Utility should be among your first stops. Unfortunately, the current version of Disk First Aid won't make repairs to. Disk First Aid, part of the Disk Utility application that comes with OS X, is designed to do just that (see 'First Aid'). Back up as many of your files as possible, reformat the disk. My Mac’s disk is not functioning properly and every time I try to repair it, I get the Error: Disk Utility can't repair this disk. Here is that message from recovery mode – First Aid found corruption that needs to be repaired.

There, I launch Disk Utility Repair on my startup SSD, but still, Disk Utility greets me with the same message. So, I restarted my Mac and went to Recovery Mode by press-holding Command + R. To repair the startup volume, run First Aid from Recovery. Run Mac's Disk Utility First Aid to repair the corrupted, unreadable, unmounted disk and what to do when Disk Utility First Aid failed to repair the disk.
