From owner-freebsd-questions@FreeBSD.ORG  Sat Sep 10 20:16:51 2011
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Message-ID: <4E6BC5B2.9020902@a1poweruser.com>
Date: Sat, 10 Sep 2011 16:16:50 -0400
From: Fbsd8 <fbsd8@a1poweruser.com>
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To: Johan Hendriks <joh.hendriks@gmail.com>
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Subject: Re: returning to 8.2 from 9.0
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Johan Hendriks wrote:
> Fbsd8 schreef:
>> Have test pc. Been running 8.2 just fine. Installed 9.0 from cd and 
>> after playing around tried to reinstall 8.2. Got error about GTP table 
>> while trying to setup the HD. Used 8.0 livecd to
>> "dd if=/del/zero of=/dev/ad0 count=5 to wipe the start of the HD clean.
>> Now 8.2 install issues this msg
>> GEOM: ad0: the primary GPT table is corrupt or invalid.
>>
>> How do I fix the HD so 8.2 will install?
>> _______________________________________________
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> maybe this little script helps you.
> http://wiki.freenas.org/faq:0129
> 
> It helped me in several situations.
> 
> If that does not do the job, you could try dban disknuke that will wipe 
> the disk completely
> 
> regards,
> Johan Hendriks
> 
> 


diskinfo da0

says Device not configured

I all ready did  "dd if=/dev/zero of=/dev/da0 count=2 to wipe the front 
of the disk.