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Date: Wed, 16 Dec 2009 12:27:15 +0100
From: Marian Hettwer <mh@kernel32.de>
To: Andriy Gapon <avg@icyb.net.ua>
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Cc: freebsd-stable@freebsd.org
Subject: Re: update to 8.0-RELEASE --> partition gone
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Hej Ho,

On Wed, 16 Dec 2009 12:55:38 +0200, Andriy Gapon <avg@icyb.net.ua> wrote:
> on 16/12/2009 11:28 Marian Hettwer said the following:
>> Hej Marcel,
>>
>>
>> On Tue, 15 Dec 2009 16:46:27 -0800, Marcel Moolenaar <xcllnt@mac.com>
>> wrote:
>>> Yes, if you have ad2a and not ad2s1a, then you have a
>>> proper dangerously dedicated disk and FreeBSD 8.x will
>>> work correctly with your disk.
>>>
>>> If you installed "dangerously dedicated" and ended up
>>> with ad0s1a (note the "s1"), then you have an invalid
>>> partitioning and FreeBSD 8.x will not give you what
>>> you've been getting on FreeBSD 7.x. Most of the time
>>> you only need to wipe out the second sector on the
>>> disk to clean it up and have FreeBSD 8.x also give
>>> you ad0s1a.
>>>
>> okay... but how do I wipe out the second sector?
>> dd if=/dev/zero of=/dev/ad8 count=1
>> would wipe out the first 512 bytes.
> 
> You need to add seek=1 (or oseek=1, which is the same but a little bit
> more
> obvious) to that command.
>
gee, thanks!
That worked.
 root@talisker:/root# ls /dev/ad8*
/dev/ad8    /dev/ad8s1  /dev/ad8s1a
root@talisker:/root# mount /dev/ad8s1a /BACKUP/
root@talisker:/root# umount /BACKUP/     

but, hm, whats that?
root@talisker:/root# fsck /dev/ad8s1a
fsck: Could not determine filesystem type

>> I'm always confused with sectors vs.
>> bytes.
> 
> You are not confused this time, HDD sector is 512 bytes.  This is the
> default dd
> block size too.
> 
Good to know!

Cheers,
Marian