I successfully Restored Grub Boot-loader But It Doesn't Work.

[Goh Lip]

On Tuesday 02,November,2010 02:23 PM, Robert Holtzman wrote:
> On Tue, Nov 02, 2010 at 01:14:32PM +0800, Goh Lip wrote:
>
>           ........snip.......
>
>>
>> Now, to answer your question, at a terminal type
>> sudo grub-install dev/sda
>
> Just to show my congenital stupidity, if you multiboot wouldn't you use
> "grub-install dev/sdaX" to specify what partition to install to?

Bob, for both grub2 and grub-legacy, grub would 'take over' the mbr - 
the first sector of the disk - and that would *not* happen if we use 
"sudo grub-install /dev/sdaX" instead of "sudo grub-install /dev/sda".

I think you meant where the grub.cfg or menu.lst would be and yes, they 
are at the partition /dev/sdaX itself. But without going into details as 
what grub "puts" into mbr, such as core.img etc., suffice to know that 
grub% overrides the mbr.

Also, it is not absolutely necessary to set the OS grub into the mbr: I 
myself do not set any of my OS grub to mbr and so I always install grub 
to sdaX or do "sudo grub-install /dev/sdaX" instead. That is because I 
have a separate "boot-loader" (in grub2) that sets itself to mbr. 
However for an overwhelming majority, there will always be an OS grub 
that sets to mbr.

Regards - Goh Lip