If you did not save the first megabyte of your hard drive before
overwriting it with your FreeDOS installation, then this is, in my
opinion, the fastest and easiest way to recover:
1. Boot a Linux system from rescue media (exactly as you did in the
session that you recently posted to this mailing list).
2. Mount the root filesystem of your Fedora system (which, if memory
serves, resides on /dev/sda2) on a suitable directory -- for the
purposes of this example, let us call it /mnt/Fedora.
3. Save the first megabyte of /dev/sda somewhere, in case you mess up
Step 4 and render your computer unbootable:
dd if=/dev/sda bs=1M count=1 of=/mnt/Fedora/Old_FreeDOS_Bootloader
4. Execute the following commands:
mount -t proc proc /mnt/Fedora/proc
mount -t sysfs sys /mnt/Fedora/sys
mount -B /dev /mnt/Fedora/dev
chroot /mnt/Fedora
grub2-install /dev/sda
5. Edit /boot/grub2/grub.cfg -- yes, this is the file that says, in
prominent capital letters, DO NOT EDIT THIS FILE -- and add a menu
entry that boots FreeDOS:
menuentry 'FREEDOS 1.3' {
set root=(hd0,3)
chainloader /BOOTSECT.DOS
}
Copy /boot/grub2/grub.cfg to /boot/grub2/grub.cfg.backup in case
some idiot runs grub2-mkconfig explicitly or implicitly.
5a. As an alternative to Step 5, if you insist on relying on
grub2-mkconfig, then put the FreeDOS menuentry into the
/etc/grub.d/40_custom file.
6. Reboot your system (you will have to exit from the chroot first).
You should see your old GRUB2 menu, with an additional menu item
that lets you boot into FreeDOS.
Jay F. Shachter
6424 North Whipple Street
Chicago IL 60645-4111
(1-773)7613784 landline
(1-410)9964737 GoogleVoice
http://m5.chicago.il.us
[email protected]
"But when she traced the killer's IP address ... it was in the
192.168/16 block!"
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