BAH! I've taken a dump and want to verify it ;)

[Rick Barter <rvb@houston.rr.com>]

I'm trying to back up my file systems (/, /var, and /usr) to tape to 
prepare for my 3.5 install.  I have taken the dump, but want to try and 
verify it.

I thought, that I could do this manually by mounting the tape, taking a 
peek at it to see if it looked good, then restoring the file systems via 
restore.  But, when I try to mount the tape I get this:

valhalla: /home/rvb01 $ sudo mount -r /dev/st0 /mnt
mount_ffs: /dev/st0 on /mnt: Inappropriate file type or format

Is it possible to mount the tape device like you do a floppy or CD-ROM. 
  If so, what am I doing wrong.  If not, how can I verify the integrity 
of my dump?

rvb