How to fix 'file system verify or repair failed' error on external hard drive?

BitRaser for File Permanently wipe files and folders, and erase traces of apps and Internet activity. View All Products. The user often experiences a problem, while handling some of the Macs, when they are not allowed to repair permissions or directory in Disk Utility. They are unable to erase or partition the drive. The error, which is thrown, is the:. The error occurs in such situations like formatting Mac as well as partitioning and verification and repairing of Mac disk.

Help! Disk Utility Failed to Repair This Disk

The reason for this error is the modification of the boot drive, or it is being used by some other process or application. Disk Utility can be run from the external drive. The one and only requirement are that Disk Utility must reside on the drive. Formatting the hard drive or partition scheme will recreate a new HFS file structure on the hard drive, which will be free from cryptic errors. This is the most recommended method to repair the error.

Disk Utility can't repair my drive? What to do now?

Any OS X boot drive is needed to complete the task. But, the important point to remember is that the installer or the recovery drive must reside in the drive, separate from the primary boot disk with the installed OS on it. The above steps offer a resolution of the problem.

The errors could have been unresolvable without a boot drive. Therefore, a bootable thumb drive was a good option. The above error may also be triggered due to first Aid or while formatting a non-boot partition. In this case, a resolution of the problem occurs with the Recovery Partition, which comes with all the newer versions of the Mac OS X. However, this is not applicable for the modification of the boot disk with the help of partitions or formatting.

Then the resolution lies in the previous method. Otherwise, we follow the steps:. This will not work with the disk that is throwing the error is the same as the primary boot partition. The solution lies only in using a separate USB drive for fixing the error. Device failure may happen any time without warning. The loyal external hard drive may not show up or mount in Finder.

Imagine how will one access the videos, documents like spreadsheets etc. Thankfully, advanced software such as Stellar Data Recovery Professional for Mac can help you recover data from an unmounted external hard drive. Vishal is a data recovery expert Stellar addressing several data loss scenarios on a macOS system. He loves to read autobiographies and his personal favourite is of Steve Jobs. View More. Hello, My Macintosh HD is attacked by a virus or malware.

I scan with antivirus software and deleted affected files. A large number of files are corrupted. Hi Gilbert, First, restart your mac Sometimes when you turn it back on, everything returns to normal. Secondly, Repair the unmounted Macintosh HD in recovery mode. Third, fixed your Macintosh HD not mounted by the terminal. Fourth, run FSCK command in single-user mode. Last if have you lost your data so you can recover with the help of Stellar Data Recovery Professional for Mac. Please help me recover as the SSD contains important projects and documents.

I suggest you to install Stellar Data Recovery Professional for Mac to recover your important documents and to avoid any data loss risk. The software scans your unrecognized SSD and list all the recoverable files. To save the files, you need to register the software.

Leverage Stellar Mac Data Recovery and you can recover data from unmounted disk conviniently. Thanks for another informative blog. Where else could I get that kind of info written in such a perfect way? Would you recommend some solution for data recovery? Yes, we have solution for unmounted data recovery on MacOS.

It may seem odd but the usual cause is a corrupt installer, and simply deleting the installer app and downloading a new copy will likely fix the issue. The error message seems to occur most often when the Mac installer is downloaded from a third-party site. This is a good reason to download the official copy from the Mac App Store, or join the free public beta program if you want to try out a new version of the Mac OS early. You can use Disk Utility to repair common boot drive errors that may be keeping you from successfully finishing an installation.

Other possible causes include a damaged boot drive. Normally, when you perform a clean install and erase the startup drive, you do so while running the macOS installer from another boot drive, perhaps a USB flash drive that you have cloned the installer to. If the installer has a problem, you may find yourself forced to reboot and use the Recovery Partition or the Internet Recovery System built into your Mac.

What Does Disk Repair on Mac Do and How It Improves Performance?

Once you have an Internet connection, the macOS Recovery utility should be able to complete the reinstall process. You should now be able to continue the recovery process and reinstall the operating system. Start by checking to see if your Mac is actually compatible with a newer version of the OS. You can check the compatibility lists at the links below. You can find instructions on repairing disk permissions in the article: Keep your Mac running its best using these simple tips. This is a similar problem to the incompatible error listed above, except it involves all Macs running macOS Sierra and later.

You can use the same links listed above to check compatibility. Make sure the date and time are set correctly.


  • Resolving Disk, Permission, and Cache Corruption.
  • How to Repair Disk and File System Problems on Your Mac.
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Be sure to verify that the time zone is also correct. Make any changes needed to ensure the settings are correct. Something as simple as the Date and Time being incorrectly set can prevent a Mac OS installation from completing. There are a number of generally helpful troubleshooting tips that can get a wayward installation back on track. While not tied to a specific installation process, these tricks have been known to correct an underlying issue and get a Mac user going again:. Sometimes these settings can get out of whack, and have unusual effects on a system installation, not to mention causing your Mac to be a bit goofy in general.

Resetting them to their default states can sometimes correct issues you may be having. At this point, you should have been able to fix the installation issue you may have encountered. Name required. Email required. Save my name, email, and website in this browser for the next time I comment.

Notify me of follow-up comments by email. Notify me of new posts by email. Leave this field empty. When I woke up the Air in the morning, it would not accept my login password.

I started in the recovery mode, used disk utility first aid to repair the disk. An error occurred while removing the previous system. Unfortunately, trying gains gives the same result. The Air will not safe start either. I always get flashing folder with question mark when I shut down and reboot. I also noticed that HD is not detected as startup disk. I started from a bootable external disk and tried Migration Assistant to recover my data and documents. Migration Assistant starts but quits without completing the migration.

Is this SSD shot, anyway to recover its contents? I do not have a recent backup.

macos - How to fix Mac “file system or verified failed”? - Ask Different

When I woke up the Pro in the morning, it would not accept my login password. Thanks Jeff. I have recently erased the data from my Macintosh Hdd. I then tried to reinstall mac os Sierra. When it checks for eligiblity, it says request timed out. Please help. El Capitan was the last OS to be listed in the app store—assuming you downloaded it from there.

For the usual inscrutable Apple reasons, they have made subsequent versions of the Mac OS harder to find. Right after I installed Mojave, however, the lower RAM slot stopped working: two chimes at intervals. Any suggestions? Revert to Sierra. You backed up your system before upgrading, right? I am reinstalling the Mac OS X high sierra in safe mode. I only have 2 minutes left to complete installation.


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