Re: What all does grub2-install copy?

[Jordan Uggla]

On Tue, Mar 13, 2012 at 2:08 AM, Michael D. Setzer II
<address@hidden> wrote:
>
> Did a test on a system.
> Copied the mbr sector.
> blanked out the first 1M of disk.
> Copied back the mbr sector
> did a grub2-install.
> copied the first 1M.
>
> Mbr being the first sector with core.img after that.
> Core.img went from byte 200 to 7D9C, but other code continued
> to F9FF before it got to the all zeroed out code.

As of grub 1.99, grub uses reed-solomon error correction,
http://en.wikipedia.org/wiki/Reed%E2%80%93Solomon_error_correction for
its embedding area, so that when DRM from Windows software like Adobe
Photoshop (Flexnet) overwrites sectors of the boot track, grub can
still recover and continue booting.

-- 
Jordan Uggla (Jordan_U on irc.freenode.net)