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Date: Mon, 26 Oct 2015 21:24:01 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Ian Fitzgerald <ianf@ozemail.com.au>
cc: freebsd-questions@freebsd.org
Subject: Re: Adding 9.1 disk to 10.2 machine
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On Tue, 27 Oct 2015, Ian Fitzgerald wrote:

> I have a second disk with data written on a FreeBSD 9.1 machine. I removed
> the disk and used the first disk for a clean install of 10.2.
>
> Re-fitting the second disk, the second disk is recognised as ada1.
>
>
>
> I wish to mount it as /disk2 (created on /), without newfs as I wish to
> retain the data on it. My attempts at placing an entry in /etc/fstab were
>
> /dev/ada1p2      /disk2    ufs          rw 2 2
>
> But at boot the OS reports disk labelling inconsistency

Please be specific about this.  The exact error message, preferably. 
The GEOM system is pickier now than in the past.  It can be overridden, 
but that can be a mistake.