In this video, I demonstrate how to solve the disk disassembly problem in macOS.
Disk Erase Error Couldn't Unmount Disk Mac Error 69888 

To avoid losing your data, always create a backup first.


After each command, press ENTER.
Commands used in video
1 - diskutil list 
2 - diskutil unmountDisk force /dev/diskx ( x - corresponds to the number of its volume)

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