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Date: Wed, 02 May 2012 09:58:08 +0400
From: "Andrey V. Elsukov" <ae@FreeBSD.org>
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To: Adam Strohl <adams-freebsd@ateamsystems.com>
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Cc: FreeBSD-Stable ML <freebsd-stable@freebsd.org>
Subject: Re: FreeBSD 9 "gptboot: invalid backup GPT header" error (boots fine
 though)
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On 30.04.2012 23:14, Adam Strohl wrote:
> da0 at tws0 bus 0 scbus0 target 0 lun 0
> da0: <LSI 9750-8i    DISK 5.12> Fixed Direct Access SCSI-5 device
> da0: 6000.000MB/s transfers
> da0: 2860992MB (5859311616 512 byte sectors: 255H 63S/T 364725C)
> 
> 
> Let me know anyone wants to see anything else/has seen this/has any theories!

Can you try patch from the r234693, update and reinstall gptboot, does it help?
	http://svnweb.freebsd.org/base?view=revision&revision=234693

-- 
WBR, Andrey V. Elsukov