1.5.1/2 release
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disklabel wd0

Just make sure how the partition looks like with the command
# disklabel wd0
My iBook S/E (no FireWire) shows following.
# /dev/rwd0c:
type: ESDI
disk: FUJITSU MHK2060A
label: fictitious
flags:
bytes/sector: 512
sectors/track: 63
tracks/cylinder: 15
sectors/cylinder: 945
cylinders: 12416
total sectors: 11733120
rpm: 3600
interleave: 1
trackskew: 0
cylinderskew: 0
headswitch: 0           # microseconds
track-to-track seek: 0  # microseconds
drivedata: 0 

11 partitions:
#        size   offset     fstype   [fsize bsize   cpg]
  a:  1024000     1544     4.2BSD        0     0     0   # (Cyl.    1*- 1085*)
  b:   593920  1025544       swap                        # (Cyl. 1085*- 1713*)
  c: 11733120        0     unused        0     0         # (Cyl.    0 - 12415)
  d:      200      320    unknown                        # (Cyl.    0*- 0*)
  e:  3686400  2643464     4.2BSD        0     0     0   # (Cyl. 2797*- 6698*)
  f:  3276800  6329864     4.2BSD        0     0     0   # (Cyl. 6698*- 10165*)
  g:  1024000  1619464     4.2BSD        0     0     0   # (Cyl. 1713*- 2797*)
  h:  1024000  9606664     4.2BSD        0     0     0   # (Cyl. 10165*- 11249*)
  i:  1036910 10630664        HFS                        # (Cyl. 11249*- 12346*)
  j:    65536 11667574        HFS                        # (Cyl. 12346*- 12415*)
  k:       10 11733110    unknown                        # (Cyl. 12415*- 12415)
disklabel: boot block size 0
disklabel: super block size 0
# 

newfs

Initialize the partion prepared. by following command
newfs /dev/rwd0a
you will see
...
newfs: ioctl (WDINFO): Invalid argument
newfs: /dev/rwd0a: can't rewrite disk label
But ignore this warning. and repeat on all the partitions you need.
Last Update: Sat, 07 Jun 2014 22:16:17 GMT 1.66 2008/03/08