df(1) and missing space in partition /dev/ada0p2

[Wojciech Puchar]

> FreeBSD aurora-clone.Sisis.de 10.0-CURRENT FreeBSD 10.0-CURRENT #2 r235646M: Thu Jul  5 09:38:00 UTC 2012 root at aurora-clone.Sisis.de:/usr/obj/usr/src/sys/GENERIC  i386
> $ df -k
> Filesystem  1024-blocks     Used    Avail Capacity  Mounted on
> /dev/ada0p2    74130588 25389436 42810708    37%    /
> devfs                 1        1        0   100%    /dev
> linprocfs             4        4        0   100%    /compat/linux/proc
> /dev/md0         126492       24   116352     0%    /tmp
> $ echo '25389436+42810708' | bc
> 68200144


only one partition is mounted and created.

I don't have idea what installer do as i don't use it.

I recommend installing manually so you have full control of how partitions 
are laid out and using what partition table format.