Problem with root filesystem

[Henry C. Schmitt]

I'm having problems doing a dump.bsd to a SyQuest removeable
cartridge.  I've formatted the cartridges, and set them up with a
slice 4 partition using SilverLining.  I have no problems dumping
the /usr and /users partitions, but when I try dumping / I get an
error:

$ dump.bsd 0fs /dev/dsk/c2d0s4 42m /
DUMP: Date of this level 0 dump: Mon Dec  3 01:32:45 1990
DUMP: Date of last level 0 dump: the epoch
DUMP: Dumping / to /dev/dsk/c2d0s4
DUMP: bad sblock magic number
DUMP: The ENTIRE dump is aborted.

Running fsstat gives the following error:

$ fsstat /
/: bad filesystem state, run fsck

So of course I ran fsck, it came up clean, no problems. But if I try
dumping again, I get the same problem.  Can anyone help me to solve
this one??
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