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

Summary: This post will explain in detail about what are the causes for the appearance of file system check code 8 and how to fix this error message in an easy way. Didn't back up important files? iBoysoft Data Recovery can help you get all lost data back.

By Katrina | Posted to Mac Data Recovery, updated on Mar. 25th, 2019 |
Table of contents
1. Problem - File system check error code is 8
2. How to fix "File system check exit code is 8" error on macOS Mojave/High Sierra/Sierra?
3. Possible causes behind Disk Utility error code 8
4. How to avoid "File system check exit code is 8" error?
5. Conclusion

Problem - File system check error code is 8

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, the exit code 0 is a good thing, which means no error is found. While the "File system check exit code is 8" indicates a corrupted file system is found during a check.

A true example is shown here:

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. Dose anyone know how to fix it?

The "File system check exit code is 8" error is especially found at the time of system check. This error has a great chance to occur on both internal hard drives and external hard drives. 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 six effective solutions.

File system check exit code is 8

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 seeing solutions.

Here is a free Mac Data Recovery program called iBoysoft Mac Data Recovery. It is very effective for recovering lost data from corrupted drives that have the file system check exit code 8 error. No matter what you are looking to retrieve, such as images, videos, audios files, text, documents, iBoysoft Mac Data Recovery is surely your best assistant. Moreover, there are numerous storage devices can be supported by this program, including hard drive, SSD, external hard drive, USB flash drive, SD card, memory card, etc. It is compatible with 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 the Applications folder.)

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

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

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

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

Besides, iBoysoft Mac Data Recovery can also be applied to other data loss scenarios. With this powerful data recovery software, you are allowed to recover deleted files on Mac, recover data from corrupted drives, recover data from unmountable drives, recover data from unreadable inaccessible and formatted hard drives.

After data recovery, you can go ahead to solve the Disk Utility exit code 8 error message with the following 6 methods.

Solution 1: Restart your Mac machine

Restarting your Mac computer will get rid of temp files, preferences, and cache are generated by Mac system and reset things to their new state. During the reboot process, all of the computer's logic is reset, including CPU, memory, controllers, and peripherals, etc. Many Mac issues can be easily solved by a simple reboot, so reboot your Mac machine if there's any problem with the Mac hard disk.

Solution 2: Boot your Mac into Safe Mode

The next step 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 3: 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.

Run Disk Utility in Recovery Mode

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.

Run Disk Utility in Recovery Mode

Step 5: Click Done and restart your Mac.

Solution 4: Update faulty applications

If you are using certain apps and programs, then it indicates the respective program is responsible for the Mac hard drive exist code 8 error. If an application gets corrupted or outdated that isn't compatible with your operating system or other installed programs, the error message may pop up. So you need to repair or upgrade these apps to fix this error.

Here are steps to upgrade your Mac system and apps installed to the latest version:

  1. Step 1: Go to Apple menu and select "App Store".
  2. Step 2: Click on the "Updates" button located on the top pane.
  3. Step 3: Check available updates for your system and applications.

Solution 5: 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.

  1. Step 1: To boot the Mac in Single User Mode, you need to ensure that your Mac is shut down totally and then press Command + S as soon as you hear the boot chime.
  2. Step 2: On successful entrance in Single User Mode, type the command fsck –fy.
  3. Step 3: If a message generated is "File system was modified", then again run fsck –fy.
  4. Step 4: If it will generate a message "The volume (name) appears to be OK", type reboot and leave Single User Mode.
  5. Use FSCK command in Single User Mode
  6. Step 5: Boot Mac back into OS.

Solution 6: Reinstall macOS

If the file system check exist code 8 error is due to corrupt or damaged system files, you can do a reinstall of macOS. Follow the procedure as below to reinstall macOS:

  1. Step 1: Make sure your Mac is connected with the Internet, then restart the Mac.
  2. Step 2: When the computer shows the gray screen after a reboot, hold down CMD + R keys.
  3. Step 3: In the macOS Utilities dialogue box, click the "Reinstall macOS" button.
  4. Reinstall macOS
  5. Step 4: Follow the on-screen instructions and complete the macOS re-installation process.

Possible causes behind Disk Utility error code 8

The file system check exit code 8 error may arise due to a number of reasons. Here are a few listed:

  • Corrupt Mac file system, system directory on the drive
  • Incorrectly configured system settings
  • Virus attack, malware or spyware infection
  • Outdated drivers/software
  • Mac startup drive or directory is loaded with Junk file/programs

The main and basic cause behind this error is file system corruption on the hard drive. In this case, you can try to repair the drive and recover data from the corrupted drive. After knowing these common causes, you may also think about how to avoid this error message.

How to avoid "File system check exit code is 8" error?

No one is willing to receive the "File system check exit code is 8" error. Fortunately, this error message can be effectively avoided with the following 6 useful tips.

  • First of all, you ought to protect your drive against viruses and malware. You'd better install an-virus software on your Mac machine and routinely scan your drives.
  • Secondly, to avoid sudden power outages, you should ensure your computer always have enough power and always shut down your system in standard ways.
  • Thirdly, you should keep cautious while deleting useless files. Sometimes, if you find your drive runs out of its storage space, you will try to free up spaces. In this situation, you should delete large and useless files with caution to prevent deleting important system files mistakenly.
  • Fourthly, check for bad sectors on your hard drive. bad sectors is a common problem on all storage devices, which will also lead to the Disk Utility error code 8. You can apply built-in Disk Utility to verify and repair the bad sector on a regular basis.
  • Fifthly, remove drives safely. If you are using a removable drive, you should eject it with using the safe option. Otherwise, the drive data will be corrupt and the file system check exit code 8 error will pop out.
  • Last but not least, back up your important data and update it regularly. Data loss can happen to anyone. Whether you lose your data due to a hardware defect or ransomware attack, having a backup could be the respite you're looking for.

Conclusion

We hope you are clear enough of all the solutions applied accordingly. If you have more suggestion or any doubts related to the file system check exit code 8 error, you can contact us via email. If the article works for you, please share with your friends on social networking sites. Thanks a lot!

Katrina

Katrina is a data recovery expert @iBoysoft who loves to help readers solve various data recovery problems.

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