OK, what has happened to me is this:

In a nutshell, all the data has virtually disappeared off one of my 
partitions. I had /dev/wd1c mounted on /home/mue57.marshall.edu and 
/dev/wd1g was unconfigured. I mounted /dev/wd1g on /mnt and newfs'ed it. 
Exited out of my su and got a message that my home directory didn't 
exist. I pwd, and it was there. I ls and it was there. I log out and log 
back in and nothing is there. I panic. I have a lot of users and my 
machine is a research machine, so all my project data is there as well. I 
log in as root and do a df... it says that I'm still occupying 170MB on 
my /dev/wd1c. I do an ls... it says that nothing is there except '.' and 
'..'. I panic more, but in a new and different way. So, I fire up fsdb 
and still there's a problem and it doesn't seem to be as useful as I 
thought it would in rebuilding the filesystem whilst retaining my data. 
So, I break down and run fsck. It finds files, but only asks if I want to 
deallocate the inodes belonging to them. No, I don't want to delete the 
data, I want to save its poor little life. So, by now my panic includes 
running in circles and issuing a high, mournful wailing sound. The awful 
thing is, I'd just switched to NetBSD from Linux, because NetBSD is 
smaller, faster and more familiar to me (SS1+ at home with SunOS 4.1.3). 
Also, I'd newfs'ed the /dev/wd1g partition in order to use it for 
backups! If there's any possible way of recovering this filesystem, I 
would really, REALLY appreciate finding out. So, if anyone out there can 
help, please do. 

Note: I'm not a newcomer, so no, my disktab entries do not overlap.

Cheers,
Ron