From owner-freebsd-hackers@FreeBSD.ORG  Tue Sep 30 05:53:16 2008
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Date: Tue, 30 Sep 2008 09:53:04 +0400
From: "Andrey V. Elsukov" <bu7cher@yandex.ru>
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To: Jeremy Chadwick <koitsu@FreeBSD.org>
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Cc: freebsd-hackers@freebsd.org,
	=?UTF-8?B?U8O4cmVuIFNjaG1pZHQ=?= <sos@FreeBSD.org>,
	Daniel Roethlisberger <daniel@roe.ch>
Subject: Re: ATA Security patch to atacontrol
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Jeremy Chadwick wrote:
> Can you provide me datasheet and technical reference material to what
> "ATA Security" is?  Which ATA specification is this documented in?  I'd
> like to read it.

I think you can found it in ATA-ATAPI-7 vol.1: "4.7 Security Mode feature set".

http://en.wikipedia.org/wiki/Advanced_Technology_Attachment#HDD_Passwords_and_Security
http://en.wikipedia.org/wiki/Advanced_Technology_Attachment#ATA_standards_versions.2C_transfer_rates.2C_and_features

-- 
WBR, Andrey V. Elsukov