Unknown fs when unmounting a disk

I have successfully mounted my USB stick, but I can't seem to unmount. Here is what I entered into the shell: [cmd=]umount -t msdosfs /dev/da0s1[/cmd] and this is what it spits out:
Code:
umount: /dev/da0s1: unknown file system

I formatted this USB stick on a computer running Windows XP by right-clicking on the USB stick, and then hitting "Format..." :\
 
If you want to unmount all your Windows filesystems in one go you can also do:
# umount -a -t msdosfs
 
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