msdof and fstab

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I am having trouble mounting my windows partition from the fstab file.  I have an entry in fstab that looks like this "/dev/ad6s5  /mnt/disk2  msdosfs  rw  0  0".  When I try to mount the disk I get the following error "mount: disk2: unknown special file or file system".  What makes things even more strange is that I can mount the slice just fine when I issue mount_msdosfs from the command prompt.  Does anyone have any ideas?