gptboot: unable to read backup GPT header

[Warren Block]

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.