HDD free space

[Евгений Шаповал]

Hi!

My problem:

When I execute "df -H"

I have:

Filesystem     Size    Used   Avail Capacity  Mounted on
/dev/ad6s1a     16G     13G    1.3G    91%    /
devfs          1.0k    1.0k      0B   100%    /dev
/dev/ad5s1d    727G    601G     68G    90%    /usr/home/reliz
/dev/ad4s1d    484G    484G    -39G   109%    /usr/home/reliz/hdd6
/dev/ad6s1d    468G    435G   -5.1G   101%    /usr/home/reliz/hdd2
/dev/ad7s1d    387G    362G   -5.9G   102%    /usr/home/reliz/hdd5
/dev/ad0s1d    242G    223G   -752k   100%    /usr/home/reliz/hdd4

line "/dev/ad4s1d    484G    484G    -39G   109%
/usr/home/reliz/hdd6" why "-39G"? how can I get correct avail space?!
=\
I must know how much space on hdd I have...

Thanks! =)