Re: grub-uninstall

[Narcis Garcia]

El 9/11/22 a les 5:20, Andrei Borzenkov ha escrit:
> On 08.11.2022 23:12, Pascal Hambourg wrote:
> > Then you can wipe the boot image in the first 440 bytes of the MBR and
> > preserve the partition table with
> >
> >    dd if=/dev/zero of=/dev/sda count=1 bs=440
>
> This leaves final 0x55aa signature which may fool BIOS into believing 
> there still *is* boot code.
>
> > IMO it is not worth wiping the core image sectors. They are useless
> > without the boot image.
>
> Yes, but it is still better to get "no boot device found" from BIOS than 
> blank screen because boot code attempted to load some garbage and 
> silently crashed or looped.

Perhaps there is some way to copy sector 0 to a file, writing a new MBR, 
and copy just partition table from file to sector 0 concrete bits.

After this, what sectors (and how) can I write next to sector 0 so rest 
of GRUB code is wiped?

All this procedure could be named "grub-uninstall" (lack at GRUB project).

--
Narcis Garcia