Originally Posted by JClosed
This works great. If your mbr is overwritten by another OS you can use the boot floppy to get into Fedora - no problem.
Some other ideas to consider for that when there is no floppy drive...
If another system's GRUB gets written into the MBR, you can boot it, stop its GRUB at the boot menu, press "c" to get the GRUB shell prompt (grub>), then boot Fedora with simple GRUB shell commands. Even the GRUB 2 boot menus still do that. Once Fedora is running, it's another simple matter to re-install its GRUB boot loader with grub-install or the usual GRUB shell commands.
Make a GRUB boot CD
to boot the machine to a grub> prompt and boot Fedora with GRUB shell commands. Or, you can add Fedora's grub.conf file to the project to make it boot straight into the Fedora boot menu. Then re-install the GRUB boot loader.
Download and create a Super Grub Disk
. Not only can its boot menu be stopped at the useful grub> prompt, the Super Grub Disk can emergency boot Linux and Windows systems (if they are still capable of being booted). It does other things, too, such as re-install GRUB and restore an "MS-like" syslinux boot loader to the MBR to make Windows boot from BIOS again. It comes in versions for Legacy GRUB, GRUB 2, floppy, CD, and USB. I think everybody using GRUB should possess one of these anyway.