Re: [Qemu-devel] Disk geometry

[C.W. Betts]

On Thursday 17 April 2008 08:55:17 am Girish V wrote:
> Hello,
>
> I am trying to use a disk image which I created using qemu for Bochs. I am
> having some issues in figuring out the geometry of the disk. Bochs requires
> that I specify
> a) the number of cylinders
> b) the number of heads
> c) the number of tracks
>
> When I do fdisk -lu fc5_3.0.2.img I get
> ---------------------------------------------------------------------------
>--------------------- last_lba(): I don't know how to handle files with mode
> 81a4
> You must set cylinders.
> You can do this from the extra functions menu.
>
> Disk fc5_3.0.2.img: 0 MB, 0 bytes
> 255 heads, 63 sectors/track, 0 cylinders, total 0 sectors
> Units = sectors of 1 * 512 = 512 bytes
>
>
>         Device Boot      Start         End      Blocks   Id  System
> fc5_3.0.2.img1   *          63    10490444     5245191   83  Linux
> fc5_3.0.2.img2        10490445    12578894     1044225   82  Linux swap /
> Solaris
> ---------------------------------------------------------------------------
>---------------------
>
> When I boot up the disk using qemu and do fdisk -lu /dev/hda from *inside
> qemu*, I get
> ---------------------------------------------------------------------------
>--------------------- Disk /dev/hda: 6442 MB, 6442450944 bytes
> 255 heads, 63 sectors/track, 783 cylinders, total 12582912 sectors
> Units = sectors of 1 * 512 = 512 bytes
>
>
>         Device Boot      Start             End       Blocks   Id     System
> /dev/hda1     *               63    10490444     5245191   83     Linux
> /dev/hda2           10490445    12578894    1044225    82     Linux swap /
> Solaris
> ---------------------------------------------------------------------------
>---------------------
>
>
> I tried using the geometry as seen inside qemu (783/255/63) in bochs but
> bochs fails with the message
> [HD   ] ata0-0 disk size doesn't match specified geometry
>
>
> Any ideas how I can use this disk. The only other option is to create a
> disk using bochs from scratch - which I would like to avoid.
>
> Any help is appreciated.
>
> Girish

I think, in order for Bochs to use it, the disk image either needs to be in RAW 
or bochs format.  You can covert it using qemu-img.  
You can also find out the format by doing 'qemu-img info' then the path to the 
disk image.

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