HD error with disklabel

[Guy Van Sanden]

I get a weird error using disklabel.
"Warning, partition c doesn't start at 0!
Warning, partition c doesn't cover the whole unit!
Warning, An incorrect partition c may cause problems for standard
system"

The thing is, it occured after a double upgrade:
FreeBSD 4.6.2 -> 5.0
BIOS upgrade (better support for large disks).

The weird part is that my old 4.6.2 disk is still in, which never gave
those
errors before, well it now does too.

The system is FreeBSD 5.0 on a Digital PC 3500.

Thanks for any suggestions.

----
nemesis# disklabel -r /dev/ad0s1
# /dev/ad0s1:
type: ESDI
disk: ad0s1
label:
flags:
bytes/sector: 512
sectors/track: 63
tracks/cylinder: 255
sectors/cylinder: 16065
cylinders: 4865
sectors/unit: 78165360
rpm: 3600
interleave: 1
trackskew: 0
cylinderskew: 0
headswitch: 0           # milliseconds
track-to-track seek: 0  # milliseconds
drivedata: 0

8 partitions:
#        size   offset    fstype   [fsize bsize bps/cpg]
  a:   327680       63    4.2BSD     2048 16384 20488   # (Cyl.    0*-
20*)
  b:  1007984   327743      swap                        # (Cyl.   20*-
83*)
  c: 78156162       63    unused        0     0         # (Cyl.    0*-
4864*)
  d:  1007616  1335727    4.2BSD     2048 16384 62984   # (Cyl.   83*-
145*)
  e:  1024000  2343343    4.2BSD     2048 16384 64008   # (Cyl.  145*-
209*)
  f: 18120704  3367343    4.2BSD     2048 16384 28552   # (Cyl.  209*-
1337*)
  g: 20971520 21488047    4.2BSD     2048 16384 28552   # (Cyl. 1337*-
2642*)
  h: 35696658 42459567    4.2BSD     2048 16384 28512   # (Cyl. 2642*-
4864*)
Warning, partition c doesn't start at 0!
Warning, partition c doesn't cover the whole unit!
Warning, An incorrect partition c may cause problems for standard system
utilities