In this situation, the problem is solved using the Recovery Partition, which is included with all subsequent versions of Mac OS X. The above issue can also occur when doing first aid or formatting a non-boot partition. Finally, on the original disc, complete the original task.įix Couldn’t Unmount Disk Mac Issue Using The Recovery Partition.Then go to “ First Aid” and double-check the disc.Select “ Disk Utility” from the boot menu.Then, in the meantime when the computer is booting, hold down the “ Option” key to select the associated boot disc.To begin, connect the USB boot drive to your Mac and restart it.You can use a USB boot device in this manner. If the disc to be edited is the boot drive, the most straightforward way is to boot the Mac system from another drive and then run Disk Utility on the disc. Resolve The Issue By Using A USB Boot Drive. Let’s move on to troubleshoot this issue: There is the risk of losing data, and the only way to protect your data is to create a full backup. You should backup disk data before attempting to fix this error with the help of the below solutions. Viruses and malware sneak into the Mac drive.Īs you have known the common causes, now it’s time to deal with the above-mentioned error by applying some quick fixes.Īlso Read: Mac Flashing Question Mark Folder Error.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. In addition, here you will also get the best Hard Drive Recovery Tool for Mac to recover deleted data after solving couldn’t unmount disk mac OS error.

Could not unmount disk when formatting