unable to unmount disk -69888 macOS

In this video I show how to fix disk unmounting issue in macOS.
Erase Disk Error Failed to Unmount Disk Mac Error 69888

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

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

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