By • 11:52 am, February 3, 2014 • OS X offers a very nice graphical user interface to verify and repair your hard drive, located in the Utilities folder. It’s called Disk Utility, and you can use it as the first line of defense when weird disk-related things happen to your Mac’s hard drive. If, however, you want to dig in a bit deeper, or you’re already running Terminal a lot and don’t want to launch a separate app, you can use the following commands to both verify (check for problems) and repair any problems that you might find when verifying.

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Launch Terminal from your Dock, Utilities folder, or via an app launcher like Alfred. Once launched, type or paste in the following command. Diskutil verifyVolume [drive name] So, for your main hard drive, you could type or paste in something like: diskutil verifyVolume / Or, if you have an external drive attached, you can type or paste in the following: diskutil verifyvolume /Volumes/[drive name]/ So for an external drive named “BackupStuff” you would enter: diskutil verifyvolume /Volumes/BackupStuff/ If you see no messages, then you can assume that diskutil hasn’t found any errors, and you can move on. If, however, you get an error like “The volume Macintosh HD was found corrupt and needs to be repaired,” then you can repair the drive using diskutil as well. To repair the drive, you can issue the following command into Terminal: diskutil repairvolume / Or, for that external drive as above: diskutil repairvolume /Volumes/BackupStuff/ Now, you may get an error (like I did) when you try to repair your hard drive, like “Live file system repair is not supported (-69673).” What I found (by running the GUI version of Disk Utility) was that I needed to run Disk Utility while in Recovery mode, so my Mac could unmount my drive to make the necessary fixes. If you get the same error, you’ll need to restart your Mac while holding down the Command-R key combination to set your Mac into recovery mode.

Once it relaunches, choose Disk Utility and verify and repair from there.

Sep 27, 2017 - I'm trying to install on a Mac mini 2014 that I have installed a SSD in. It restarts and says unable to unmount disk for repair and fails the install.

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Building upon previous answers, I have concluded that the problem is because the installer is glitched and can't convert the drive to APFS. This problem can easily be circumvented: 1. Boot to internet recovery or a USB drive with the High Sierra Installer (standard Sierra recovery mode won't do). Go to Disk Utility and mount your Mac volume. Close Disk Utility and go to the command line terminal. Do diskutil umount force /Volumes/Macintosh HD/ Take note of your disk id.

Disk1 in my case. Run diskutil apfs convert /dev/disk1s1 (replace disk1 with your disk id if needed) 6. Once this is done, reboot and High Sierra can be installed from either a USB drive or Internet Recovery mode (option+command+R). Ditto on my 2015 Macbook Pro. Created a USB stick with High Sierra, booted off that, ran Diskutil against the SSD on the laptop, no errors reported, but can't unmount the disk there too. Entered the terminal, did a diskutil unmount /dev/disk21, failed with a UID=0 voted no (or something like that) error and didn't unmount the disk.

Next I tried a diskkutil unmount force /dev/diskk21 command, that got the device unmounted. Ran disktuiil volumerepair on it now, no errors. Rebooted back to the ssd, tried the install again. Next step is to take a fresh time machine backup, wipe the disk, install High Sierra on it, then restore from the backup.

I had 'success' by doing the following: 1. Boot into internet recovery mode Option-Command-R 2. Open Terminal and force unmount the drive •diskutil list •diskutil unmountDisk force /dev/disk 3. Open Diskutil and reformat the drive to APFS ****Note that you will lose any data stored on the drive**** 4. Install High Sierra I tried disabling time machine, running disk recovery, re-installing Sierra through recovery mode (failed / file unavailable), re-installing High Sierra via recovery mode (installer failed), installing Sierra via a USB drive (hold down option, select USB drive with image on it), and probably something else I'm forgetting to mention. I had intended on further testing/troubleshooting how to get this to work without blowing away my install but my TimeMachine backup (took 12+ hours to restore) somehow prompted me for the wrong Apple ID (I had changed mine about a year ago) and wouldn't let me progress with the restore past that.

Given the time I've spent trying to fix this it is ultimately faster to just flatten and re-install. Same problem here. Tried updating by booting from install stick. No joy Took it into Apple - after some diagnostics they determined that there was no problem with the actual drive, but after a few different 'levels' of diagnositcs - they finally determined that it was a 'software error' (not hardware). At this point the apple guy was quick to say the only way to fix it - was wipe the drive and go from there, and warned me that if I did a restore from Time Machine - the problem would come back. Ironically - he wiped the drive after I acknowledged his advice, thinking I gave him consent (he knew I had a fresh backup). When I realized what was going on - I felt sorry for the dude.