From owner-freebsd-hackers@FreeBSD.ORG  Wed Jan 25 12:50:47 2012
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Date: Wed, 25 Jan 2012 13:50:46 +0100
From: Dimitry Andric <dim@FreeBSD.org>
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To: Ed Maste <emaste@freebsd.org>
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Cc: Garrett Cooper <yanegomi@gmail.com>, freebsd-hackers@freebsd.org
Subject: Re: Parallels v4 regression (aka ada(4) oddity) in RELENG_9
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On 2012-01-23 19:46, Ed Maste wrote:
...
> Do you have the reproduction steps documented somewhere (and if not, can
> you write them up)?  In order to have working automated installs we need
> to be able to unconditionally reinit a drive w/o having behavoiur depend
> on what happens to be left behind.

Maybe just zero the first and last N sectors of the drive, where N is
10,000 or greater?