When should I use Disk First Aid versus DiskWarrior?
Try Disk First Aid first to repair a Mac-formatted disk. If it reports: Scan complete. Problems were found, but Disk First Aid cannot repair them, try DiskWarrior. Use DiskWarrior if the disk is: not mounting (not appearing on the desktop when the computer is started); missing files or folders; or crashes when its files are used. DiskWarrior rebuilds your disk directory using data recovered from the original directory, thereby recovering files and folders that were lost.
Try Disk First Aid first to repair a Mac-formatted disk. If it reports: ‘Scan complete. Problems were found, but Disk First Aid cannot repair them’, try DiskWarrior. Use DiskWarrior if the disk is: not mounting (not appearing on the desktop when the computer is started); missing files or folders; or crashes when its files are used. DiskWarrior rebuilds your disk directory using data recovered from the original directory, thereby recovering files and folders that were lost.