couldn't unmount disk -69888 | macOS

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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