Dual Boot

[Tom H]

On Sun, Nov 28, 2010 at 6:08 PM, Nathan Bahn <nathan.bahn at gmail.com> wrote:
> On Sun, Nov 28, 2010 at 5:41 AM, Tom H <tomh0665 at gmail.com> wrote:
>> On Sat, Nov 27, 2010 at 10:20 PM, Nathan Bahn <nathan.bahn at gmail.com>
>> wrote:
>>>
>>> Wait a minute!  I thought dual-booting created partitions that cannot be
>>> breached!
>>
>> core.img is embedded into the post-MBR gap and not a partition.
>
> I am sorry, but I know what neither a core.img nor a post-MBR gap is.  May I
> trouble you for a link to some references?

Heard of Google?

Anyway:

Core.img is grub2's equivalent of grub1's stage 1.5.

If you run "fdisk -lu /dev/sda", you'll see that /dev/sda1 starts at
63 (for a default Ubuntu install; Lubuntu and Fedora start at 2048).
Sector 0 is the MBR and sectors 1-62 are the post-MBR gap.