305 GB hard drive reduced to 266 GB (why?)

[Peter]

Le Vendredi 2 Février 2007 18:46, Peter A. Giessel a écrit :
> On 2007/02/02 14:39, Peter seems to have typed:
> > I am installing a new 6.2 STABLE system and I am troubled by the
> > amount of available disk space I'm getting on one of my IDE
> > devices:
>
> Its in the FAQ:
> http://www.freebsd.org/doc/en_US.ISO8859-1/books/faq/disks.html#MANUF
>ACTURER-DISK-SIZE

I already took account of manufacturer disk size.  However, I didn't 
know about the FreeBSD 8% rule which accounts for the discrepancy 
between my disk size of 289 GB and its available space of 266 GB.

So now my question becomes "Where does FreeBSD get 289 from 305?".

PM