From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.33)
	id 1CabP7-0003si-6T
	for qemu-devel@nongnu.org; Sat, 04 Dec 2004 10:00:57 -0500
Received: from exim by lists.gnu.org with spam-scanned (Exim 4.33)
	id 1CabP6-0003s8-BC
	for qemu-devel@nongnu.org; Sat, 04 Dec 2004 10:00:56 -0500
Received: from [199.232.76.173] (helo=monty-python.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.33) id 1CabP5-0003rs-T2
	for qemu-devel@nongnu.org; Sat, 04 Dec 2004 10:00:55 -0500
Received: from [212.16.62.51] (helo=mail.13thfloor.at)
	by monty-python.gnu.org with esmtp (Exim 4.34) id 1CabFA-0003Ny-VR
	for qemu-devel@nongnu.org; Sat, 04 Dec 2004 09:50:41 -0500
Date: Sat, 4 Dec 2004 15:50:34 +0100
From: Herbert Poetzl <herbert@13thfloor.at>
Subject: Re: [Qemu-devel] Qemu limited to 11GB
Message-ID: <20041204145034.GB670@mail.13thfloor.at>
References: <Pine.LNX.4.61.0412041228240.921@horsea.3ti.be>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <Pine.LNX.4.61.0412041228240.921@horsea.3ti.be>
Reply-To: qemu-devel@nongnu.org
List-Id: qemu-devel.nongnu.org
List-Unsubscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/pipermail/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Dag Wieers <dag@wieers.com>
Cc: qemu-devel@nongnu.org

On Sat, Dec 04, 2004 at 12:32:42PM +0100, Dag Wieers wrote:
> Hi,
> 
> When I try to use a 80GB disk with qemu, the BIOS (and underlying os) 
> reports it as a 10GB disk. I've tried providing the CHS values using 
> -hdachs, but it does not work either.
> 
> 	qemu -hdachs "155061,16,63" -hda /dev/hda

115061 % 65536 = 23989

23989*16*63*512/1024^3 = 11

try using 255/256 heads instead of the 16 heads ...


http://www.allensmith.net/Storage/HDDlimit/Address.htm

                       BIOS    IDE Limit 
---------------------------------------- 
 Maximum Cylinders     1024  65536  1024
 Maximum Heads          256     16    16
 Max. Sectors/track      63    256    63


HTH,
Herbert

> Is qemu limited to < 11GB disks, is there a bug or am I doing something 
> wrong ? :)
> 
> The disk is said to be 10786 MB by the qemu BIOS, while in reality 
> Linux reports: 80026 MB. Linux reports CHS=65535/16/63, while fdisk 
> reports: 155061,16,63
> 
> It would be useful to have the qemu BIOS print out the CHS it is using.
> 
> Kind regards,
> --   dag wieers,  dag@wieers.com,  http://dag.wieers.com/   --
> [all I want is a warm bed and a kind word and unlimited power]
> 
> 
> _______________________________________________
> Qemu-devel mailing list
> Qemu-devel@nongnu.org
> http://lists.nongnu.org/mailman/listinfo/qemu-devel