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Date: Wed, 18 Mar 2009 18:53:28 +0200
From: Andriy Gapon <avg@freebsd.org>
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To: Marcel Moolenaar <xcllnt@mac.com>
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Cc: freebsd-geom@freebsd.org
Subject: Re: gpart bootcode and /boot/boot
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on 18/03/2009 18:23 Marcel Moolenaar said the following:
> 
> On Mar 18, 2009, at 8:51 AM, Andriy Gapon wrote:
>> BTW, is there a way to read/backup bootcode (for BSD scheme)?
> 
> There's no gpart function for it yet, but you can use dd
> as a work-around. Unfortunately, that means you need to
> know how much to read:
>     MBR:    1 sector (512B) starting at 0
>     BSD:    16 sectors (8KB) starting at 0
> 
> These raw dumps can be restored using gpart:
>     gpart bootcode -b $mbr.dd ad6
>     gpart bootcode -b $bsd.dd ad6s1
> 
> No, it will not destroy any partitioning data :-)

O great, thanks!
So gpart simply ignores bytes of "input" data that correspond to partition/label
data. Good to know.

-- 
Andriy Gapon