Strange fstype in bsdlabel output

[Jos Backus]

traitor:~% mount   
/dev/da0s1a on / (ufs, local)
devfs on /dev (devfs, local)
/dev/da0s1f on /localhome (ufs, local, soft-updates)
/dev/da0s1e on /usr (ufs, local, soft-updates)
/dev/da0s1d on /var (ufs, local, soft-updates)
/dev/md0 on /tmp (ufs, local, nodev, nosuid, soft-updates)
procfs on /proc (procfs, local)
linprocfs on /usr/compat/linux/proc (linprocfs, local)
fdescfs on /dev/fd (fdescfs)
traitor:~% dumpfs /dev/da0s1d | grep UFS
magic   11954 (UFS1)    time    Wed Aug  6 10:34:03 2003
traitor:~% dumpfs /dev/da0s1e | grep UFS
magic   11954 (UFS1)    time    Wed Aug  6 10:26:10 2003
traitor:~% dumpfs /dev/da0s1f | grep UFS
magic   11954 (UFS1)    time    Wed Aug  6 10:19:16 2003
traitor:~% bsdlabel da0s1
# /dev/da0s1:
8 partitions:
#        size   offset    fstype   [fsize bsize bps/cpg]
  a:   262144        0    4.2BSD     2048 16384 16392 
  b:  2097152   262144    unused        0     0       
  c: 35551782        0    unused        0     0         # "raw" part, don't edit
  d:  1048576  2359296    unused        0     0       
  e: 12582912  3407872    unused        0     0       
  f: 19560998 15990784    unused        0     0       
traitor:~% 

Why are d,e,f designated as `unused'? Shouldn't they be `4.2BSD' instead?

-- 
Jos Backus                       _/  _/_/_/      Sunnyvale, CA
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jos at catnook.com        _/_/   _/_/_/          require 'std/disclaimer'