Re: [Qemu-devel] Re: Boot Failure (CDROM boot failure code : 0004)

[Natalia Portillo <claunia@claunia.com>]

You are absolutely wrong.

If the CD is bootable, with the down dd command, the .ISO file is bootable.

That is true, checked by myself, for Power Macintosh, PReP, El Torito 
(IBM PC compatibles 32-bit and 64-bit, and AmigaONE), Sparc, Intel Mac, 
Pegasos/Efika and Amiga.
Surely it is true also for other architectures, as long as the CD is 
standard at 2048-bytes/sec or 512-bytes/sec and dd gave no errors.

Jens Axboe escribió:
> On Mon, Jun 16 2008, Volkan YAZICI wrote:
>   
>> On Mon, 16 Jun 2008, Laurent Vivier <Laurent.Vivier@bull.net> writes:
>>     
>>> could you burn a CD with your .iso and try to boot a real PC ?
>>>       
>> I created the ISO image from the same CD that's inserted into the
>> /dev/scd0 using below command:
>>
>>   root:~# dd bs=$[1024 * 32] \
>>   > if=/dev/scd0 \
>>   > of=/root/windows-server-2003-standard-x86-64-sp2.iso
>>
>> And I'm sure CD is bootable. (Not pirated, original.) OTOH, if we'd
>> assume the ISO image is corrupted for some unknown reason, why "-cdrom
>> /dev/scd0" didn't work?
>>     
>
> You can't just do a dd and expect the output to be bootable, that wont
> include the floppy boot image. So nothing wrong with qemu, that iso
> would not be bootable if burned either.
>
>