Trouble with newfs under 2.0

[Robert Prohaska]

What induces newfs to announce ".....preposterous size -1" in response to
newfs -v /dev/dsk/c6d0s3 MN330 ?

/dev/dsk/c6d0s3 was created using mknod per the instructions 
provided by Vicky Brown of Apple and posted here some months (?)
ago.  The command was accepted without error, the disk partition
having been created with Silverlining as Random A/UX.  /dev/rdsk/c6d0s3
was also created at the same time.  The disk is a Wren Runner,
which I've been told is equivalent to (same as) a Micronet 330.  The
partition in question is the 244-odd M left over after installation
of the aux root filesystem.

Any help is appreciated

bob prohaska