![]() ![]() Human error: Deleting or formatting the files or data improperly in between the ongoing operations can cause disk error.The other reasons for 'Couldn't Unmount Volume' error are: The causes of this error are several, starting with the abrupt shutdown and inconsistent file system. What causes the 'Couldn't Unmount Volume' error? Usually, the error 'Couldn't Unmount Disk' shows up when you try to format, partition, verify or repair internal disk by Disk Utility on Mac system.Unmounting a disk means disconnecting a disk drive or optical disk from the computer.To know about the solutions, first, let's understand about unmounting and disk utility, and the causes of the disk error. Part 1- What does "couldn't unmount disk" mean? Part 4 - Learn, "How to Use Disk Utility?".Part 3 - Recover lost files on Mac after all methods fail.Part 2 - 4 methods to fix "Couldn't Unmount Disk" on Mac.For more information visit Part 1 - What does' couldn't unmount disk mean? Shirley Zhang is a data recovery expert in DataNumen, Inc., which is the world leader in data recovery technologies, including damaged mdf and outlook repair software products. Based on your own case, you can opt to ask the disk repair shop nearby for help or search and contact the online disk repair service. Of course, if all means mentioned above can’t rescue you from the annoying error message, your last resort is to ask professionals for help. You should find and choose a reliable and experienced one that can help you perform the original task without such an error. Also, it’s pretty easy for you to find third party tools for formatting, partitioning or modifying disk. What’s more, fortunately, there are a lot of repair utilities dedicated to fixing this error on today’s market. Replace the “/dev/diskx” with the correct disk number, such as “/dev/disk1”. Lastly, you should type “sudo diskutil unmountDisk force /dev/diskx” line.At this time, you ought to find out the disk that you want to force unmount.Then, input the “diskutil list” line, which will list out all the disks on the Mac.To begin with, you have to access Terminal application.Moreover, you can also attempt to eradicate this error, forcing unmounting disk by command line. Lastly, select “First Aid” to re-verify the disk or choose “Erase” to format the disk at your will.Next, access Disk Utility from the boot menu.Then, when booting, hold down the “Option” key to select Recovery Partition.At this point, you can try solving it with Recovery Partition. If the error message appears during “First Aid” or formatting a non-boot disk, the above means will not make effects surely. Lastly, just perform the original task on the original disk.After that, go to “First Aid” and verify the disk.Next, in the boot menu, select “Disk Utility”.Then, during booting, you should hold down the “Option” key button to select the attached boot drive.First off, insert the USB boot drive to Mac and reboot.By this means, you can make use of USB boot drive. If this error occurs in that the disk to be modified is the boot drive, the simplest solution is to boot the Mac system from another drive and then run Disk Utility on the disk. Therefore, it is imperative to resolve this error as soon as possible. When this error pops up, not only will the Disk Utility halt suddenly, but also the disk will suffer as well, such as damaged data on this disk, like damaged Outlook file. ![]() This error generally results from improper modification of the boot drive, such as partitioning, disk verification or repairing or formatting. However, it still can fail to fix disk issues accompanied with some error messages, such as “Couldn’t Unmount Disk” error. This article will focus on this error and provide 5 feasible solutions.ĭisk Utility plays an extremely important and good role in solving disk problems on Mac system. “Couldn’t Unmount Disk” error message usually pops up when you try formatting, partitioning, verifying or repairing internal disk by Disk Utility on Mac system. ![]()
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