Re: What does grub-install do?

[Dennis Cao]

Very useful. I begin to understand what 'grub-install' does.
Thanks a lot for your help :)


2010/10/2 Goh Lip <address@hidden>:
> On Friday 01,October,2010 11:32 PM, Dennis Cao wrote:
>>
>> Now, I find another confusing problem. If I choose to boot from USB
>> Hard Disk(/dev/sdb1), the screen will show the welcome message of Grub
>> 1.97 beta, then it quickly show the grub menu which is configured in
>> the hard disk (/dev/sda8).
>>
>> I wonder whether this is caused by the command 'grub-install'? Because
>> I still do not very understand what '--root-directory' does in the
>> grub-install command.  According to Goh's explanation, I guess it
>> installs the boot.img and core.img to specified device and tried to
>> load 'grub.cfg' from {boot-device}:{root-directory}. Is it right?
>>
>
> Cao, when you just do a "grub-install /dev/sda" it 'sets' the grub to the
> mbr. Similarly, when you do a "grub-install /dev/sdb" it sets the grub to
> that disk's (sdb) mbr section. So when you boot from sdb directly, it uses
> the grub from where it was set from. That's what exactly it does.
>
> When you do a "grub-install --root-directory=/media/something /dev/sda", it
> creates a /boot and /boot/grub/ (without any grub.cfg) from the OS to that
> /media/something and sets the /media/something's grub to the mbr.
>
> Hope that is clear. Good luck again.
>
> Regards - Goh Lip
>
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>



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曹贵林 ( Dennis Cao )