Re: [Qemu-devel] Qemu limited to 11GB

[Herbert Poetzl]

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,  address@hidden,  http://dag.wieers.com/   --
> [all I want is a warm bed and a kind word and unlimited power]
> 
> 
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