How to create a GRUB bootable CD?

I had installed linux OS which had grub as a bootloader. i messed with some configuration and now i'm stuck. my computer won't load. i know the changes which i made and i can fix it through grub bootable [did that several time before]. but i've misplaced my grub bootable cd. can anybody help me with this??

GRUB supports the no emulation mode.This means that you can use the whole CD-ROM from GRUB and you don't have to make a floppy or hard disk image file, which can cause compatibility problems.For booting from a CD-ROM, GRUB need to have stage2_eltorito and optionally a config file.

Here is an example of procedures to make a bootable CD-ROM image. First, make a top directory for the bootable image.

Code:

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$ mkdir iso

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Make a directory for GRUB:

Code:

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$ mkdir -p iso/boot/grub

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Now copy the file stage2_eltorito:

Code:

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$ cp /usr/lib/grub/i386-pc/stage2_eltorito iso/boot/grub

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If desired, make the config file menu.lst under iso/boot/grub.

Code:

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# Sample boot menu configuration file

# By default, boot the first entry.

default 0

# The first entry as counting starts with number zero, not one.

# Boot automatically after 30 secs.
timeout 30

# GRUB will boot automatically in 30 seconds, unless interrupted with a keypress.

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Finally, make a ISO9660 image file like this:

Code:

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$ mkisofs -R -b boot/grub/stage2_eltorito -no-emul-boot \ -boot-load-size 4 -boot-info-table -o grub.iso

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Hey thanks man! i'll try it out as soon as i get on my PC. Actually i'm not very familiar with linux OS, wanna know why "load size 4" option is used to make bootable image? is it necessary?

No. You can ignore it if u have a newer computer, but some old computers need it for bios compatibility. All the Best!