sumesh wrote:
> What is El Torito?

Google is your friend.  So is Wikipedia:
http://en.wikipedia.org/wiki/El_Torito_%28CD-ROM_standard%29

> How can I create a bootable cdrom
> containing Redhat Linux Operating system

With regards to booting, use ISOLINUX to load the kernel.

> I have downloaded and installed Smart Boot Manager into a floppy
> disk and set default boot option as cdrom.It works.Now I want to copy
> the boot sector of the floppy to a file and chainload the file from
> grub.For that how much bytes should I dd from /dev/fd0

Good question.  Not sure.
Bernhard Treutwein suggests 18kB here:
http://www.lrz-muenchen.de/~bernhard/grub-chain-cd.html

Not sure where he got that number :-).
The source code for SBM including 'sbminst' is available, so you could
check that out.


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