Here is the video version, if you prefer it:
To unmount a device, type in the following command: (Ward, 2014)
umount mountpoint
where mountpoint is the mount point of the device. Mind the spelling of the command.
Hope you learned something useful!
References
Ward, B. (2014). How Linux Works: What Every Superuser Should Know (2nd ed.). No Starch Press. Page 76
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