From owner-freebsd-questions  Wed Apr 26 14:52:18 2000
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Date:   Wed, 26 Apr 2000 23:51:47 +0200
From: Erik Trulsson <ertr1013@student.csd.uu.se>
To: xvudpapc <xvudpapc@savba.sk>
Cc: freebsd-questions@FreeBSD.ORG
Subject: Re: BIOS supports, systems not
Message-ID: <20000426235146.A1915@student.csd.uu.se>
References: <39075D07.A7DE86DE@savba.sk>
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In-Reply-To: <39075D07.A7DE86DE@savba.sk>; from xvudpapc@savba.sk on Wed, Apr 26, 2000 at 11:17:59PM +0200
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On Wed, Apr 26, 2000 at 11:17:59PM +0200, xvudpapc wrote:
> Hello,
> 
> I have a question. My BIOS declares it knows and writes out the full
> capacity of my disk (8.4 GB) in BIOS setup,
> but no system is aware of it. I use BEOS, WIN98, OS/2, LINUX and
> FREEBSD. Every system of these declares the disk is 8 GB big. I have a
> Linux on a second disk. Is there a way I can tell FreeBSD in boot time
> how many cylinders, heads and sectors to use? My FreeBSD says this: ad0
> 16383/16/63. Although this is possible to tell it in Linux to Lilo.conf
> or at boot time, Linux is not my 8.4 GB disk.
> 

Both your OS and your BIOS is correct :-)
You see harddisk-manufacturers consider 1 gigabyte = 10^9 bytes
while most OS have 1 gigabyte = 2^30 bytes.
You see, 8GB (with 1GB=2^30 bytes) = 8.4GB (with 1GB=10^9 bytes) so nothing
wrong.
(And if you do the calculation you will see that 16383*16*63*512 = 8.4*10^9)


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