This should lead you to "Operation Successful," on both the disk and each volume. Run First Aid on the main one and then on the volume(s). Once Disk Utility appears on the screen, turn on the drive and make sure all volumes are mounted. Once you reach Recovery Mode, select Disk Utility. Go into Recovery Mode by restarting your computer and pressing command + R simultaneously. What you need to do is eject/unmount each volume and then turn off the external hard drive (you can leave the external hard drive plugged in, just turn it off.) I'm posting the solution just in case anyone ever has the same problem and errors because the people at Apple Support will not help you since they don't know how to fix this issue and will just wash their hands off the problem by telling you to contacting Customer Support for your drive's manufacturer. What must I do for this external hard drive to start cooperating with me again?Īlright. I want to run First Aid successfully on all partitions and for Disk Utility to let me make the two partitions mentioned above, without having the dreadful "Uninitialized," partition reappear. What's most curious about this is that even though I get an error at the end, First Aid tells me that, " File system check exit code is 0." However, when I run First Aid on the "Untitled," partition, I get this error: An internal error has occurred. When I run First Aid on the disk as a whole, the operation is successful. I am left with one 3TB partition labeled "Untitled." Please verify and repair each volume individually and then try again. This time, though, I can delete the Uninitialized partition, but the same error ( Couldn’t modify partition map because file system verification failed. When I try to make three partitions so that I can manually delete the "Untitled," partition by reducing its size (since I can't just (-) this partition once it is selected), the horrible Zero KB * Uninitialized partition reappears in its place. I finally have only one 3TB partition labeled "Untitled." My woes did not end here, however.Īs I tried to partition the drive into (1) a 2TB partition for Time Machine and (2) a 1TB partition for specific files backup, I get this error: Couldn’t modify partition map because file system verification failed. “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.I finally managed to get rid of the Zero KB * partition formatted as "Uninitialized," by formatting the entire drive to APFS and then back to Mac OS Extended (Journaled). 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. However, it still can fail to fix disk issues accompanied with some error messages, such as “Couldn’t Unmount Disk” error. This error generally results from improper modification of the boot drive, such as partitioning, disk verification or repairing or formatting. #MAC DATA RESCUE UNMOUNTED PARTITION VERIFICATION# 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. Therefore, it is imperative to resolve this error as soon as possible. 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. 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. Lastly, just perform the original task on the original disk.After that, go to “First Aid” and verify the disk. If the error message appears during “First Aid” or formatting a non-boot disk, the above means will not make effects surely. 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. #MAC DATA RESCUE UNMOUNTED PARTITION VERIFICATION#.
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