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Date:      Tue, 31 Jan 2017 07:43:00 -0800 (PST)
From:      "Rodney W. Grimes" <freebsd-rwg@pdx.rh.CN85.dnsmgr.net>
To:        Warren Block <wblock@wonkity.com>
Cc:        "Andrey V. Elsukov" <bu7cher@yandex.ru>, freebsd-hackers@freebsd.org, Slawa Olhovchenkov <slw@zxy.spb.ru>
Subject:   Re: How to safely remove rest of GTP?
Message-ID:  <201701311543.v0VFh0Bl044986@pdx.rh.CN85.dnsmgr.net>
In-Reply-To: <alpine.BSF.2.20.1701301607510.85129@wonkity.com>

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... much deleted ...
> 
> > It is impossible to have a corrupted GPT and some 
> > other type of partition table in the same time.

I believe that statement is in error.
dd if=/boot/boot0 of=/dev/ada0
Would not that lead to this very situation if done
to a GPT parted disk drive?

> Maybe when only using FreeBSD and gpart, but I'm pretty sure I've seen 
> forum users who have tried some crappy other formatting tool and have 
> overwritten the primary GPT with a valid MBR and left the secondary GPT 
> untouched.  This only becomes obvious when they bring the disk back to a 
> FreeBSD system.

As almost all MBR tools are un aware of GPT so well not do anything to
destroy the secondary GPT, so this is infact very likely to occur.


-- 
Rod Grimes                                                 rgrimes@freebsd.org



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