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Date: Mon, 26 Nov 2012 22:34:33 -0700 (MST)
From: Warren Block <wblock@wonkity.com>
To: "Ronald F. Guilmette" <rfg@tristatelogic.com>
Subject: Re: Advanced Format Drive ?
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On Mon, 26 Nov 2012, Ronald F. Guilmette wrote:

> Starting sector 2048 is definitely a multiple of 4KB, so I am assuming
> that all I really need to do here in order to use this new drive as extra
> stroage for a FreeBSD system (assuming that I am happy with good old
> fashioned MBR style partitioning, which I am) is just:
>
>    newfs -U /dev/da1s1

You should also change the partition type to freebsd or freebsd-ufs. 
Offhand I'd guess they're both 0xa5, but have not looked.  Use 'gpart 
modify'.