UbuntuHelp:GrubHowto/BootFloppy

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https://help.ubuntu.com/community/GrubHowto/BootFloppy

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English

Making a GRUB boot floppy.

GRUB (GRand Unified Bootloader) is the boot manager installed by default in recent versions of Ubuntu Linux. It is an effort by the GNU project to provide a bootloader that supports the greatest number of operating systems. This document explains how to make a boot floppy that can either boot an installed operating system or present you with a GRUB command shell so that you can enter commands directly. It assumes that you are making the diskette on an Ubuntu Linux box.

1. Obtain root privileges.

 sudo -s  </code>

2. Format the floppy with the ext2 filesystem:
<pre>
 mke2fs /dev/fd0 </code>

3. Mount the floppy and copy the files that GRUB needs to make it bootable:
<pre>
 mount /dev/fd0 /media/floppy
 mkdir /media/floppy/boot
 mkdir /media/floppy/boot/grub
 cd /boot/grub
 cp stage1 stage2 /media/floppy/boot/grub  </code>

If you want to boot the operating system already installed on the
machine you are making the floppy from, also copy
/boot/grub/menu.lst and /boot/grub/device.map to the corresponding
directories on the floppy.

4. Unmount the floppy (umount /dev/fd0), then start GRUB in
interactive mode by typing grub. You will see the GRUB command
prompt (grub >). Enter these commands:
<pre>
 device (fd0) /dev/fd0
 root (fd0)
 setup (fd0)
 quit   </code>

5. At this point, you have a bootable floppy. If you added the extra
files mentioned above, you should get a standard GRUB screen when
you boot from it, just as if you had booted from the
hard drive.

6. If you want to be extra cautious, you can save a copy of the current
machine's master boot record to a file on the floppy. The following 
example assumes the master boot record is on device hda; the file containing 
the boot record is named boot.mbr.
<pre>
 dd if=/dev/hda of=/media/floppy/boot.mbr bs=512 count=1  </code>

To restore it, you would just reverse the parameters of the dd
command:
<pre>
 dd if=/media/floppy/boot.mbr of=/dev/hda bs=512 count=1 </code>

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