This is a bit complicated, sorry for the lengthy description...

I had netbsd running on a 660 AV with the original 80MB hard drive 
internal (id 0), a 500MB external hard drive (id 6), a zip drive (id 3), 
and an external cd drive (id 4) on the scsi chain.  netbsd is installed 
on the external hard drive.  Everything worked. (so, of course, I had to 
fiddle some more!)

I switched my external drive to the internal bay (replacing the original 
internal drive) and unplugged the rest of my scsi devices.  When I try 
to reboot into netbsd, it can't mount the swap partition (it says device 
not configured).  It then tries to run fsck, but can't and dumps me into 
a sh without finishing the boot process.  My usr partition won't mount.

I put the old internal drive into the external case and plugged it into 
the chain (now both drives are on the scsi chain again).  That does not 
work either.

If I then also plug the zip and cd into the chain (so back to the 
original scsi chain with the internal and external drives switched), 
netbsd boots without any trouble!

I don't have a clue.  I was hoping to turn this box into a headless 
router without any other devices plugged in, so I'm also frustrated.  
Any suggestions would be greatly appreciated.

Patrick