[nmglug] Restoring MBR

[William D. Nystrom]

This seems more complicated.  Are you saying that you tried the method
suggested by Ravi and that it did not work?

Thanks,

-- 
Dave Nystrom
LANL X-2
Phone: 505-667-7913
Fax:   505-665-2227
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       Group X-2
       Los Alamos National Laboratory
       Los Alamos, NM 87545

On Tue, September 27, 2005 12:10 pm, Mars DeLapp said:
> William D. Nystrom wrote:
>> I recently went through the following scenario.
>>
>> 1.  Formatted partitions on a new hard drive and installed Fedora Core
>> 3.
>>
>> 2.  Installed Windows XP on one of the partitions which clobbered my
>> MBR.
>>
>> 3.  Reinstalled Fedora Core 3 because I could not figure out another way
>>     to restore my MBR.  I tried the Rescue disk but perhaps I did not
>> know
>>     what I was doing.
>>
>> Is there an easy way to restore the MBR if it has been clobbered by a
>> Windows install?  I'm using grub as my boot loader.
>>
>> Thanks,
>>
>
> I just went through this with one of my machines. Here is how I restored
> the mater boot record (MBR)
>
> Boot with a Knoppix disk or other system rescue disk.
>
> get a root prompt and run grub
>
> 	# grub
>
> then set the GRUB's root device to the partition containing the boot
> directory
>
> 	grub> root (hd0,0)
>
> Once you've set the root device correctly, run the command setup
>
> 	grub> setup (hd0)
>
> I spent many hours trying to figure this out. For some reason,
> grub-install would not install grub in the MBR. It is
> supposed to work. I don't know why it would not.
> For details see
> http://www.gnu.org/software/grub/manual/grub.html#Installing-GRUB-natively
>
> After you get the MBR restored, you might still need to update
> /boot/grub/menu.lst.
> Mount your root partition
> 	# mkdir /mnt/hda1
> 	# mount /dev/hda1 /mnt/hda1 -O rw
> If boot is on a separate partition, mount it now
> 	# mount /dev/hda2 /mnt/hda1/boot -O rw
> chroot to the root directory
> 	# chroot /dev/hda1
> run update-grub
> 	# update-grub
>
> All the above assumes your root partition is hda1. Make adjustments as
> needed.
>
> Mars
>
> --
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> President
> DeLapp & Associates, Inc. dba DeLapp Engineering
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