How does FreeBSD calculate disk sizes

[Odhiambo Washington]

Hello users,

I have a disk which is actually 72GB. 2GB has been used as swap while
the rest was given to /.

Can someone explain to me what I could be missing here, because what
I am seeing isn't what I expect. Perhaps it's just right while I am
the dumb one. Why isn't the whole size reported?


sucks# uname -nmr
sucks.wananchi.com 5.1-RELEASE-p10 i386

sucks# df -h
Filesystem    Size   Used  Avail Capacity  Mounted on
/dev/da0s1a    64G   1.8G    57G     3%    /
devfs         1.0K   1.0K     0B   100%    /dev


Here is what the partition editor shows:


Disk name:      da0                                    FDISK Partition Editor
DISK Geometry:  8855 cyls/255 heads/63 sectors = 142255575 sectors (69460MB)

Offset       Size(ST)        End     Name  PType       Desc  Subtype    Flags

         0         63         62        -     12     unused        0
        63  142255512  142255574    da0s1      8    freebsd      165
 142255575       8425  142263999        -     12     unused        0 



And disklabel shows this:



sucks# disklabel -n da0s1a
# /dev/da0s1a:
8 partitions:
#        size   offset    fstype   [fsize bsize bps/cpg]
  a: 138255512       63    4.2BSD     2048 16384 28552 
  b:  4000000 138255575      swap                    
  c: 142255512       63    unused        0     0         # "raw" part, don't edit
partition a: partition extends past end of unit
partition b: offset past end of unit
partition b: partition extends past end of unit
partition c: partition extends past end of unit
disklabel: partition c doesn't start at 0!
disklabel: partition c doesn't cover the whole unit!
disklabel: An incorrect partition c may cause problems for standard system utilities


Some expert explanation would help clear my ignorance!

Thank you.

-Wash

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