When a disk won't 'Unmount"

UNIX macOS
1

hdiutil detach -Force disk&number

(ex:hdiutil detach -Force disk1)

2

Is this problem solved? When forcing an unmount you should check why it won't unmount in the normal way.

3

This solves the problem just fine. Most glitches in the dismount are program related, (it's obvious to check for the causes)...checking for the causes was not why I posted this solution. Hope it helps a few folks out there.

UMH

4

you can also do this:

diskutil unmountDisk force /Volumes/<name of drive>

example:
diskutil unmountDisk force /Volumes/Video\ 800