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Date: Thu, 20 Sep 2007 09:22:00 +0200 (CEST)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: jekillen <jekillen@prodigy.net>
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Cc: FreeBSD Mailing List <freebsd-questions@freebsd.org>
Subject: Re: Hard drive RPM
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> not a case of misrepresentations that I have found on network
> attached hard disk storage devices and Firewire drives.
> I have one that was expressly advertised on the package to be
> 120 Gb capacity, and in fact only 111Gb are available for storage.

common marketlie: telling capacity not in gigabytes (2^30) but in billions 
of bytes. in computers giga always meant 2^30 (like mega 2^20 and kilo 
2^10) but they found just another place to lie.

on all (most) drive there are numbers of sectors written on label.
one sector is half a REAL kilobyte, divide it by 2^21 to get gigabyte 
count.