Removing Grub

Alessandro Brezzi alessandro.brezzi at gmail.com
Fri Sep 7 14:09:20 UTC 2007


2007/9/7, Jacques B. <jjrboucher at gmail.com>:
>
> >
> >
> > ... sorry, wrong typing; the corret block size is 466 and not 496. I
> > apologize.
> >
> > --
> > Alessandro Brezzi
>
> Not quite.  446.  The first sector is 512 bytes.  The first 446 bytes
> is the MBR.  The next 64 bytes is the partition record (4 X16 - hence
> why you can only have 4 primary partitions) followed by the magic #
> \x55 \xaa.  446(MBR)+64(parition table)+2(magic number)=512.
>
> You can view the partition table by doing the following as root
> (assuming your primary hard drive is /dev/hda for this example).
>
> dd if=/dev/hda bs=1 skip=446 count=64 |xxd
>
> This will give you the 4 partitions (16 bytes per line so one
> partition per line).  The one that starts with \x80 is the bootable
> partition.
>
> Likewise if you only want to see the MBR then as root
> dd if=/dev/hda bs=446 count=1 |xxd
>
> And the magic number \x55 \xaa
> dd if=/dev/hda bs=1 skip=510 count=2 |xxd
>
> Jacques B.


Ok, so this confirm I''ve to wait and think twice, for not to made invalid
assertions ... You are correct: forgot to evaluate correctly bs / count and
skip.
Another occasion for apologize. Sorry Mikkel and all.

-- 
Alessandro Brezzi
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