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Date: Fri, 24 Feb 2012 08:33:21 -0700 (MST)
From: Warren Block <wblock@wonkity.com>
To: Omer Faruk SEN <omerfsen@gmail.com>
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	(wonkity.com [127.0.0.1]); Fri, 24 Feb 2012 08:33:21 -0700 (MST)
Cc: freebsd-questions@freebsd.org
Subject: Re: 8.3-BETA1 installation problem
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On Fri, 24 Feb 2012, Omer Faruk SEN wrote:

> Already done that but still habe the same issue. I can dd and sysctl but
> after installing without using W at disk label screen still no luck. I have
> also done
> sysctl kern.geom.debugflags=16 on fixit and restarted installation but
> still getting the same error.

[Please don't top-post, it makes responding more difficult.]

>> If you need to clear the old MBR the "old way", use a LiveFS or Fixit shell
>> and do this (as root):
>>
>> sysctl kern.geom.debugflags=16  and:
>>
>> dd if=/dev/zero of=/dev/adx oseek=1 bs=512 count=1

The sysctl is not necessary.  The dd may not erase enough of the disk. 
It will erase a bsdlabel, but not the MBR/PMBR.  As always, be warned 
that this will erase the partition table on that disk, so make sure it's 
the correct target disk and that you have full backups:

   dd if=/dev/zero of=/dev/adX bs=512 count=34

Replace X with the correct drive number.