I'm running NetBSD-1.1 on a 486.  I have a 124M IDE
drive serving as my system drive, and I'm trying to use a second
drive for /usr/local and /home.  I have two problems: (1) I can't 
specify anything from the second drive in /etc/fstab, or my machine 
will panic at boot during the automatic fsck, and (2) I can't dump
those filesystems, because dump reports a bad sblock magic number.
I think these two are symptoms of the same problem.

	The second drive was previously mounted under NetBSD-1.0.
I did whatever the install document recommended to convert them.
I could use the second drive, but I had to mount it by hand.  I 
thought that redoing the drive under 1.1 might take care of it, so
I tried that, and it had no effect.  I was curious what the sblock 
magic number was, so I modified dump to print it out.  Dump told me
that fs_magic was 0.  I was a bit more curious, so I had dump spit
out some more of the superblock data, like fs_ntrak.  These things
were all 0, too.

	Perhaps it's that my /etc/disktab entry is wrong.  Maybe it's
possible that I got the size or offset wrong and that one partition
is overwriting the superblock of the next.  Here's the entry:

st3290|Seagate 249MB IDE:\
	:dt=ST506:ty=winchester:se#512:nt#15:ns#34:nc#1001: \
	:pc#510510:oc#0: \
	:pd#510510:od#0: \
	:pg#102000:og#0:tg=4.2BSD:bg#4096:fg#1024: \
	:ph#408510:oh#102000:th=4.2BSD:bh#4096:fh#1024:

	When redoing the drive under 1.1 didn't work, I decided to
do a low-level format of the drive.  This didn't fix the problem.

	Based on the assumption that I was overwriting the superblock,
I made the drive one partition as:

	:ph#510510:oh#0:th=4.2BSD:bh#4096:fh#1024:

	I still saw the errant behavior.  I'm guessing that the 
two problems I listed are symptoms of the same behavior because the
errors I got during booting were divide-by-zero errors, and it appeared 
that most of the data in the superblock was zero.  My questions are:

	1) Has anyone else noticed this behavior?
	2) Is there anything else I should check?
	3) Is this worth opening a PR for?  I checked the bugs database
	   and didn't find anything that seemed to be this problem.

Chad Mynhier <mynhier@cs.utk.edu>
Sorcerer's Apprentice, CS Department        
University of Tennessee, Knoxville                   
WWW: http://www.cs.utk.edu/~mynhier/