1) Use either the DOS or NetBSD fdisk  to make the NetBSD partition the   
primary (active) partition.
2) Turn off the IDE drive in the BIOS
3) Boot off the SCSI drive with NetBSD
4) then do your disklabel

disklabel works on the active partition of a drive.

Once you've done all of this, you can us fdisk under NetBSD and DOS to   
set the other bootable.

There is a NetBSD bootloader that I found, a long time ago, that will   
allow you to boot into NetBSD from DOS!  As a matter of fact, you don't   
even need to have a bootblock written to the NetBSD partition, though I   
highly recommend having one there in case of trouble.  I don't know who   
did it, but I love it.  If you and others are interested, I can make it   
available, with instructions, via FTP.

jam

 ----------
From:  owner-port-i386[SMTP:owner-port-i386@NetBSD.ORG]
Sent:  Thursday, March 28, 1996 3:07 AM
To:  port-i386
Subject:  How to write NetBSD boot blocks to DOS disk?


I have a 540MB EIDE drive with NetBSD and MS-DOS partitions peacefully
coexisting.  I have a 100MB DOS/Win95 partition (for maintenance
purposes, like configuring "software configurable" cards and such),
and the rest is a backup root/usr alternate boot system (backup
because it's normally "turned off" in the BIOS, and the machine boots
straight up into my NetBSD SCSI drives).

Like I said, I have the NetBSD and MS-DOS paritions working on the
same disk.  But, I can't boot the NetBSD parition off the EIDE drive.
How do I write the NetBSD boot blocks?  When I try "disklable -B ..."
it trashes the MS-DOS partition data.  I know others have made this
work.  How did you do it?

For your entertainment, here is my disklabel proto file:

# /dev/rwd0d:
type: ST506
disk: WDC2540
label: WDC AC2540F
flags:
bytes/sector: 512
sectors/track: 63
tracks/cylinder: 16
sectors/cylinder: 1008
cylinders: 1048
total sectors: 1056384
rpm: 4500
interleave: 1
trackskew: 0
cylinderskew: 0
headswitch: 0           # milliseconds
track-to-track seek: 0  # milliseconds
drivedata: 0

7 partitions:
#        size   offset    fstype   [fsize bsize   cpg]
  a:    65520   205632    4.2BSD     1024  8192    16   # / (root)
  b:    97776   271152      swap        0     0         # swap
  c:   850752   205632    unused        0     0         # (Cyl.  204 -   
1047)
  d:  1056384        0    unused        0     0         # (Cyl.    0 -   
1047)
  e:   687456   368928    4.2BSD     2048 16384    16   # /usr
  g:   205569       63     MSDOS                        # (Cyl.    0*-   
203*)


 --------------------------------------------------------------------------  
 ---
  Michael L. VanLoon   
                                michaelv@HeadCandy.com
       --<  Free your mind and your machine -- NetBSD free un*x  >--
     NetBSD working ports: 386+PC, Mac 68k, Amiga, HP300, Sun3, Sun4,
                           DEC PMAX (MIPS), DEC Alpha, PC532
     NetBSD ports in progress: VAX, Atari 68k, others...
 --------------------------------------------------------------------------  
 ---