geometry does not match label (255h,63s != 16h,63s)

[regis505]

What are the meaning of the messages below when I boot 8.0-RELEASE-p1 and how
can I prevent that?

GEOM: ad6s1: geometry does not match label (255h,63s != 16h,63s).
...
GEOM: ad6s2: geometry does not match label (255h,63s != 16h,63s).
GEOM: ufsid/478e98a7fe5111d0: geometry does not match label (255h,63s !=
16h,63s).
GEOM: ufsid/479a0892240b3994: geometry does not match label (255h,63s !=
16h,63s).

# fdisk -s
/dev/ad4: 484406 cyl 16 hd 63 sec
Part        Start        Size Type Flags
   1:          63   488281185 0xa5 0x80

# disklabel ad4s1
# /dev/ad4s1:
8 partitions:
#        size   offset    fstype   [fsize bsize bps/cpg]
  a:  4194304        0    4.2BSD     2048 16384 28552
  b:  8388608  4194304      swap
  c: 488281185        0    unused        0     0         # "raw" part, don't
edit
  d: 41943040 12582912    4.2BSD     2048 16384 28552
  e: 41943040 54525952    4.2BSD        0     0     0
  f: 67108864 96468992    4.2BSD     2048 16384 28552
  g: 324703329 163577856    4.2BSD        0     0     0

-reg
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