![]() ![]() It's worth noting that forcibly unmounting a disk may cause data loss, so ensure that you are unmounting the correct drive by following the instruction below carefully. Solution 3: Force unmount the drive with Terminalįormatting the drive after forcibly unmounting it is a potential fix for both error 69877 (couldn't open the device) and error 69888 (couldn't unmount disk). If that's of no avail, try to force-unmount the disk in Terminal first, then erase it. Similarly, you can erase the entire disk when the erase process has failed on the volumes. If you succeed at erasing the volumes, test the disk again. Therefore, if you can't erase the whole disk, try to erase volumes under it. If one of the volumes is posing problems, you won't be able to erase the disk. When you erase a disk, you are handing with all volumes it contains. If Mac won't format the external hard drive as before, try solution 2.
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