Restoring grub on MBR

Wolfgang Messingschlager w.mess at freenet.de
Mon Sep 22 09:50:40 PDT 2008


randhir phagura wrote:
> Wolfgang wrote on 22 Sep 08:
> 
>> Hi Randhir,
>  
>> that is correct that you cannot boot if the MBR is gone or corrupt. But 
>> in this case you need only a bootable medium e.g. LFS live CD/DVD and 
>> then you can repair the MBR with dd command.
>  
>> Another alternative is if you have a discete drive to write the MBR to a 
>> discete with dd.
>  
>  
>> Wolfgang
> 
> Hi Wolfgang,
> 
> That is very good. I have checked and seen that your first command does, in fact, copy the MBR on to the file: /boot/mbr_$TS.
> However, I am not very clear whether, it will copy the file back to MBR from within the 'Live LFS CD/DVD', without first chrooting into  your linux installed on /dev/hda. I shall try it next time when I have a similar mishap.
> 
> Have not understood "Another alternative is if you have a discete drive to write the MBR to a discete with dd." Do you mean a disket?
> 
> Anyway thanks a lot for the responses. It is a pleasure to converse with you!
> 
> Regards,
> 
> Randhir
> 
Hi Randir,


yes I mean a disket and floppy drive. I have yesterday seen from chapter 
8.4 that

dd if=/boot/grub/stage1 of=/dev/fd0 bs=512 count=1
dd if=/boot/grub/stage2 of=/dev/fd0 bs=512 seek=1

may be helpful as well. You can give it a try as well.


Wolfgang

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