returning to 8.2 from 9.0

Johan Hendriks joh.hendriks at
Sat Sep 10 20:42:45 UTC 2011

Fbsd8 schreef:
> 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.
>> 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.
i now see two different things?
dd if=/del/zero of=/dev/ad0 count=5
dd if=/dev/zero of=/dev/da0 count=2

first your disk is adx and the second time it is dax

Make sure you use the right disk.
There is also a part add the end of the disk that needs to be wiped, not 
only the start of the disk.

Johan Hendriks

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