If the driver is used by other applications or processes.There are numerous reasons that can trigger the ‘failed to unmount because it is currently in use’ issue.īut below I have shortlisted the three major factors behind the occurrence of this problem. Essentially, your Mac’s erase process has failed. If you get an error message saying can’t unmount disk mac terminal, it usually means a process on your Mac is attempting to modify your boot disk but is unable to do so because macOS won’t allow the disk from which it booted to be unmounted.įor example, you won’t be able to erase or partition your boot disk in Disk Utility because macOS will not unmount the disk. Recover Data from Macintosh HD After Fixing Can’t Unmount Disk Mac When An External Disk Has Failed To Unmount Macintosh HD, What Should You Do? Resolve The Issue by Using A USB Boot Drive.What Does It Imply When It Says “Couldn’t Unmount Disk Mac OS”? * Free version of the program only scans and previews recoverable objects.

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