![]() When your Mac is getting the “Couldn’t Unmount Disk” error when using the Disk Utility, it is possible that the boot drive cannot be modified because it is being used by some process or an application. What Causes the “Couldn’t Unmount Disk” Error in Disk Utility for Mac? Once this pops up, the current process gets halted and could no longer proceed, affecting any troubleshooting process or disk repair you might be doing. Disk Utility stopped verifying (letter of the hard disk).About Outbyte, uninstall instructions, EULA, Privacy Policy. Here are some variations of the error message that Mac users encounter, depending on the process being executed when the error happened: What makes this error frustrating is that there is usually very little to no additional information provided by the error message, making it more challenging to resolve the problem, And based on the error message, it is even harder to determine what the problem is all about. The “Couldn’t Unmount Disk” error can happen during formatting, partitioning, disk verification and repair, or any task that the Disk Utility undertakes. What is the “Couldn’t Unmount Disk” Error on Mac? When this error pops up, any attempted task gets stopped right in its tracks. ![]() One of the common errors encountered when using Disk Utility is the “Couldn’t Unmount Disk” error. Use it when your apps quit unexpectedly, your external drive isn’t working, or your Mac won’t start up.ĭisk Utility usually works smoothly, but there are times when frustrating errors occur and prevent the process from being completed. It can check the health of your hard drive and repair any disk errors. ![]() Here, you need to use some 3rd party commercial applications like Stellar Volume Repair Software which might be helpful in repairing disk permissions and also solving your issue.Disk Utility is a crucial tool for resolving disk issues on your Mac. Additionally, on a Retina display the text will be tiny – but still readable if you move closer to the screen!ģ.Final solution (use a commercial applications): You’ll need to temporarily disable it for further use. Note that you might not be able to enter Single User Mode if you have a firmware password set. When you’ve finished in Single User Mode, type the following to reboot: However, you might be able to make note of its output and do a quick Google search to check a solution of this problem. Of course, you may never see this because even this trick might not be able to fix your disk. Repeat another two or three times until you have a message similar to this returned: If you see the following message at the end of the repair: Just wait until the flashing text cursor appears and type the following command: This will boot you into Single User mode and things will suddenly go very Linux, with a text-based display. ![]() Now, release it when the boot progress bar indicator will appear. For backup, you can either use in-built Mac software like Time Machine or 3rd party tools like Stellar Drive Clone, Carbon Copy Cloner, etc.ĭo a last minute ditch repair, by booting your Mac OS X before the Apple logo will appear by holding down the Cmd+S button from your keyboard. So, if you are facing this issue, then try below mentioned few tricks: -īefore you do anything, makes sure you have proper Mac backup available on an external drive, which can come handy in case of data loss situation. Back up as many of your files as possible, reformat the disk, and restore your backed-up files.” Is one of the most common error which occur when you use Disk Utility in a bid to solve a problem and Disk Utility has shrugged its shoulders and given up. In Mac there are several errors which is difficult to cumbersome whenever they encounter and “Error: Disk Utility can’t repair this disk. I let it do it's thing for a few hours when it was done, the disk was automatically remounted and could be browsed in Finder. In my case, my external drive (which I use for Time Machine backups) was given the name "/dev/disk4s4", and indeed the filesystem check program (fsck_hfs) command was still running. To see whether this is the case, you can run the "process status" command in a Console shell: Macbook-Pro: ~ luthien$ sudo ps ax | grep hfsĦ05 ? R 4:08.59 /System/Library/Filesystems/hfs.fs/Contents/Resources/./fsck_hfs -y /dev/disk4s4 If the external drive's activity indicator is blinking, but you are otherwise unable to access the drive, then some background process is working on your disk. Your Mac will not be able to mount the disk until after the automatic checks are complete. If you receive this message from Disk Utility after replugging an external drive that wasn't successfully ejected (or unmounted), it could be that the OS is already busy performing the repair in the background.
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