However, it can only repair small and minor errors on disks in case the issue is out of its reach, then in such a case, the errors will get reported as ‘file system check exit code is 8’. Although, Mac OS X consists of various tools that can fix and repair partition, disk, and file system errors, out of which Disk Utility – First Aid, the most common to be used. The ‘File system check exit code is 8’ or ‘Mac hard drive exit code 8’ errors occur mainly at the time of system check and is capable of taking place in both internal and external hard drives. What is ‘File System Check Exit Code is 8’ Error? How can ‘File system check exit code is 8’ Error be Avoided?.Solution 4: Reinstall macOS to Get Rid of Corrupted or Damaged System Files.Solution 3: Fix ‘File system exit code is 8’ Error with FSCK Command.