Re: How many sectors for GRUB 2

[Andrey Borzenkov]

В Sat, 03 Nov 2012 17:38:09 +0100
Ulf Zibis <address@hidden> пишет:

> Am 03.11.2012 16:58, schrieb Andrey Borzenkov:
> >> No, I'm absolutely unsure. That's why I'm asking here on the list.
> >> My question in little other words: How to dertermine, how many
> >> bytes of the gap between MBR and 1st partition are used by GRUB 2,
> >> so should not be deleted or shrinked or used otherwise
> >>
> >
> > You could try findgrub
> > http://www.unixversal.com/linux/openSUSE/findgrub-4.4.1.tgz and/or
> > bootinfoscript
> > (https://github.com/arvidjaar/bootinfoscript/blob/master/bootinfoscript
> > - I point to my repo because SF variant did not work with GRUB2 we
> >    have here on openSUSE). Both scripts scan disks for bootloaders.
> 
> Thanks!
> Hm, it seems you are now getting unsure about your first answer:
> "core.img is *the* part of grub which is installed in MBR gap"
> 

core.img is the part that is installed in MBR gap, but it does not mean
that it was this particular file. grub-install creates core.img
in /boot/grub and embeds it in the same run, but it is also possible to
directly use

grub-mkimage -o /tmp/foo.img ...
grub-bios-setup -c /tmp/foo.img ...

You wanted to be absolutely safe and sure. The only way to be is to
reinstall grub using grub-install.

> Hopefully some developers are reading this thread. Maybe they could
> implement a new option, reporting GRUB 2's size in the MBR gap.
> 

Did you try any of script I mentioned? If they did not work we need to
fix them.