From owner-freebsd-current@FreeBSD.ORG  Fri Aug 19 02:39:56 2011
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Date: Thu, 18 Aug 2011 20:39:54 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Michal Varga <varga.michal@gmail.com>
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	(wonkity.com [127.0.0.1]); Thu, 18 Aug 2011 20:39:55 -0600 (MDT)
Cc: Garrett Cooper <yanegomi@gmail.com>,
	FreeBSD Current <freebsd-current@freebsd.org>,
	Nathan Whitehorn <nwhitehorn@freebsd.org>
Subject: Re: Well, there goes Windows!
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On Fri, 19 Aug 2011, Michal Varga wrote:

> On Thu, 2011-08-18 at 16:24 -0700, Garrett Cooper wrote:
>> So, I used the bsdinstaller again on the 9.0-BETA1 media with manual
>> partitioning. The HP desktop ate up 3 partitions, I inconveniently
>> forgot that geom can't grok secondary PC MBR partitions, was fooling
>> around and cleared the partitions, etc. I hit abort to exit the
>> partitioner start and from scratch and now my Windows partitions and
>> recovery partitions are gone.
>
> Well, there's "gone" and there's really "gone" (but obviously, this is
> not a pleasant situation in any case).
>
> Just as a quick reminder for anyone who might not know (as this happens
> regularly) - sysutils/testdisk should be able to recover those cleared
> partitions pretty easily and put them back in place.

Or back up the GPT sectors first.

   dd if=/dev/ada0 of=gpt.bak bs=512 count=35

Or really, back up the whole disk first.  Clonezilla is handy for that.