[Solved] File system check exit code is 8 on macOS Mojave/High Sierra/Sierra

Posted by Katrina to Mac Data Recovery on November 9th, 2018

I have a WD external hard drive used to back up on High Sierra. Last night, I tried ejecting the disc but got an error that it could not unmount. I run First Aid in Disk Utility, but it just failed to fix the trouble and reported an error saying: "The volume could not be verified completely. File system check exit code 8". I’ve done some searches, and I haven’t found information on this error code. Anyone know how to fix it?

Mac OS X contains a variety of tools for repairing disk, partition, and file system errors. Disk Utility’s First Aid is the most frequently-used one. But First Aid can only fix minor errors on disks, if the problem is beyond its reach, some error messages will be reported, such as "File system check exit code is 8". Normally, an exit code 0 is a good thing, which means no error is found. The "File system check exit code is 8" indicates a corrupted file system is found during a check.

The "File system check exit code is 8" error will occur not only on internal hard drive but also on external hard drive. It is caused by numerous reasons including virus attack, sudden power failure, catalog file corruption, invalid volume header, etc. How to fix “File system check exit code is 8” error on macOS Mojave 10.14/High Sierra 10.13/Sierra? In this post, we will share four effective solutions.

How to fix "File system check exit code is 8" error on macOS Mojave/High Sierra/Sierra?

First at first: Back up data

Fortunately, the "File system check exit code is 8" error is not difficult to solve. But the solving process is possible to overwrite your original data, resulting in irreparable data loss. Have you backed up important data? If not, we strongly recommend you to recover data from internal hard drives/external hard drives that have the "File system check exit code is 8" error firstly. If you don’t care about data on the drive, please skip to see solutions.

Here is a free Mac Data Recovery program called iBoysoft Mac Data Recovery. iBoysoft Mac Data Recovery is able to recover data from corrupted dirve, recover data from unmountable drive, recover data from unreadable drive, recover data from inaccessible, formatted hard drive, SSD, external hard drive, USB flash drive, SD card, memory card, etc. macOS Mojave 10.14/High Sierra 10.13/10.12/10.11/10.10/10.9/10.8/10.7.

Tutorial to recover data from the corrupted drive that has "File system check exit code is 8" error on Mac

Step 1: Download iBoysoft Mac Data Recovery, and then double click the installation package to launch this software. (We needn't install the software by dragging the package to Applications folder.)

file system verify or repair failed'

Step 2: Select the drive that has "File system check exit code is 8" error, and click button to scan lost files.

Recover data from drive that has "File system check exit code is 8" error

Step 3: Preview the scanning results and choose files we want to recover, then click Recover button to get those files back.

Step 4: Have a check to ensure we have got all lost files back.

Solution 1: Boot into Safe Mode

The first try is to boot your Mac into Safe Mode. Restart your Mac computer and hold the button of the “Shift” while it’s booting. Input your secret word and your Macintosh will then check your disks. This will cost much time, please be patient. When it’s finished signing in and you see a work area, the disk check is finished. You can reboot your Macintosh now.

Solution 2: Run Disk Utility in Recovery Mode

Apple recovery mode is available in an emergency when your macOS is running into serious difficulties. Even when your Mac won’t boot, you can access your computer to manage your hard drive, repair disk errors and reinstall OS.

Step 1: Boot your Mac into Recovery Mode.

Step 2: From the macOS Utilities menu, select Disk Utility.

Step 3: Select the disk that has "File system check exit code is 8" error.

Step 4: Click First Aid on the top menu bar.

Step 5: Click Done and restart your Mac.

Solution 3: Use FSCK command in Single User Mode

If the two solutions above can’t deal with the “File system check exit code is 8 error” on internal hard drive/external hard drive, you need to boot your Mac computer into Single User Mode and run FSCK command.

Step 1: To boot the Mac in Single User Mode, you need to ensure that your Mac is shut down totally and the press Command + S as soon as you hear the boot chime.

Step 2: On successful entrance in Single User Mode, type the command fsck –fy.

Tips: If a message generated is "File system was modified", then again run fsck –fy.

Step 3: If it will generate a message "The volume (name) appears to be OK", type reboot and leave Single User Mode.

Use FSCK command in Single User Mode

Step 4: Boot Mac back into OS.

Solution 4: Reformatting the corrupted drive in Disk Utility

Step 1: Launch Disk Utility from Utilities and select the drive that has 'file system verify or repair failed' error.

Step 2: Choose Erase function, complete related information (name, format, scheme), and then click Erase button.

Still have questions?