cd /dev
./MAKEDEV rz9
MAKEDEV: special file(s) for rz9: 
rz9a rrz9a rz9b rrz9b rz9c rrz9c rz9d rrz9d rz9e rrz9e rz9f rrz9f rz9g rrz9g rz9h rrz9h 
cd /tmp
disklabel -z rz9
disklabel -rw rz9
disklabel -r rz9 > /tmp/rz9.new
# /dev/rrz9a:
type: SCSI
disk: RZ1CB-CS
label: 
flags: dynamic_geometry
bytes/sector: 512
sectors/track: 113
tracks/cylinder: 20
sectors/cylinder: 2260
cylinders: 3708
sectors/unit: 8380080
rpm: 7228
interleave: 1
trackskew: 40
cylinderskew: 75
headswitch: 0		# milliseconds
track-to-track seek: 0	# milliseconds
drivedata: 0 

8 partitions:
#          size     offset    fstype   [fsize bsize   cpg]      # NOTE: values not exact
  a:     131072          0    unused        0     0       	# (Cyl.    0 - 57*)
  b:     262144     131072    unused        0     0       	# (Cyl.   57*- 173*)
  c:    8380080          0    unused        0     0       	# (Cyl.    0 - 3707)
  d:          0          0    unused        0     0       	# (Cyl.    0 - -1)
  e:          0          0    unused        0     0       	# (Cyl.    0 - -1)
  f:          0          0    unused        0     0       	# (Cyl.    0 - -1)
  g:    3993432     393216    unused        0     0       	# (Cyl.  173*- 1940*)
  h:    3993432    4386648    unused        0     0       	# (Cyl. 1940*- 3707)
vi /tmp/rz9.new
# /dev/rrz9a:
type: SCSI
disk: RZ1CB-CS
label: 
flags: dynamic_geometry
bytes/sector: 512
sectors/track: 113
tracks/cylinder: 20
sectors/cylinder: 2260
cylinders: 3708
sectors/unit: 8380080
rpm: 7228
interleave: 1
trackskew: 40
cylinderskew: 75
headswitch: 0		# milliseconds
track-to-track seek: 0	# milliseconds
drivedata: 0 

8 partitions:
#          size     offset    fstype   [fsize bsize   cpg]      # NOTE: values not exact
  a:          0          0    unused        0     0       	# (Cyl.    0 - 57*)
  b:     262144     131072    unused        0     0       	# (Cyl.   57*- 173*)
  c:    8380080          0    unused        0     0       	# (Cyl.    0 - 3707)
  d:          0          0    unused        0     0       	# (Cyl.    0 - -1)
  e:          0          0    unused        0     0       	# (Cyl.    0 - -1)
  f:          0          0    unused        0     0       	# (Cyl.    0 - -1)
  g:    3993432     393216    unused        0     0       	# (Cyl.  173*- 1940*)
  h:    3993432    4386648    unused        0     0       	# (Cyl. 1940*- 3707)
disklabel -Rr rz9 /tmp/rz9.new RZ1CB-CS
disklabel: ioctl DIOCSDINFO: Open partition would move or shrink
Use alternate partition