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Date: Fri, 7 Feb 2014 09:30:04 -0700 (MST)
From: Warren Block <wblock@wonkity.com>
To: Christopher Sean Hilton <chris@vindaloo.com>
Subject: Re: gptboot: unable to read backup GPT header
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On Wed, 5 Feb 2014, Christopher Sean Hilton wrote:

> I'm getting this on a freshly installed FreeBSD 9.2 System. It boots
> fine but the error message has me concerned. Has anyone encountered
> and fixed this?

New to me.  Could you describe the hardware, particularly whether a RAID 
controller or an external USB drive is involved?

The exact output of the error message (in context) would help.  The 
output of 'gpart show' might be useful.