How to unmount automounted volumes?

Sorry if this comes across as completely dense, but how do I unmount a volume that was mounted by amd via the automounter package? E.g. I plug in my thumb drive, and it mounts automatically to a directory in /media/dev. But if I run umount on it as user or root, I get this:

Code:
# umount /dev/da0
umount: /dev/da0: unknown file system

This happens for any device mounted via automounter. How do I unmount the device so I can remove it?
 
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