Disklabel for Mirrorset on HSG80

I have a mirrorset on two HSG80's. I have it configured as folllows:

HSG BOTTOM>sho dev
Name Type Port Targ Lun Used by
------------------------------------------------------------------------------
DISK10000 disk 1 0 0 MIRR1
DISK10100 disk 1 1 0
DISK10200 disk 1 2 0
DISK20000 disk 2 0 0 MIRR1
DISK20100 disk 2 1 0
DISK20200 disk 2 2 0

HSG BOTTOM>sho mirr
Name Storageset Uses Used by
------------------------------------------------------------------------------
MIRR1 mirrorset DISK10000 D0
DISK20000

The disks in question are Model: BF0728A4BA disks from HP. They have
72.8GB of space on them. I did the following on my Tru64 4.0F server
to mount this raid:

$> disklabel -wr /dev/rrz16a
$> disklabel /dev/rrz16a
# /dev/rrz16a:
type: SCSI
disk: HSG80
label:
flags:
bytes/sector: 512
sectors/track: 255
tracks/cylinder: 4
sectors/cylinder: 1020
cylinders: 8369
sectors/unit: 142229253
rpm: 3600
interleave: 1
trackskew: 7
cylinderskew: 26
headswitch: 0 # milliseconds
track-to-track seek: 0 # milliseconds
drivedata: 0

8 partitions:
# size offset fstype [fsize bsize cpg] #
NOTE: values n ot exact
a: 131072 0 unused 0 0 #
(Cyl. 0 - 1 28*)
b: 262144 131072 unused 0 0 #
(Cyl. 128*- 3 85*)
c: 142229253 0 unused 0 0 #
(Cyl. 0 - 1 39440*)
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: 70918018 393216 unused 0 0 #
(Cyl. 385*- 6 9912*)
h: 70918019 71311234 unused 0 0 #
(Cyl. 69912*- 139440*)

I then did a newfs on partition 'c' to use the whole disk and mounted it:
$>df -k
Filesystem Size Used Avail Use% Mounted on
/dev/rz16c 68883207 1 61994885 1% /mnt

That shows roughly 66G gigs for size and only 59G available. A far
cry from 72.8GB as labeled. So, is it my disklabel that is screwed or
maybe a config on the HSG? Or, is it that HP reports 72.8GB using
1000 1024K blocks as opposed to 1024 1024K blocks? Also, why is the
partition size shown as 66G but only had 59G available.

Thanks,

fybar

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