nmanisca@vt.edu said:
> This fs was created under NetBSD 1.3.3.  I can mount this  fs under
> Digital UNIX 4.0D but it says it's a dirty fs.  I found out the hard
> way that if you fsck it under Digital UNIX you will destroy it :( 

I've played with this a while ago. What I found is that the DU fs
looks like an old-style BSD fs. One can mount it from NetBSD,
it will be recognized by the compatibility code. The other way
doesn't work.
It might be worth a try to create an old style fs with newfs -O
on NetBSD and mount it from DU. (I didn't test it!)

best regards
Matthias