From owner-freebsd-hardware@FreeBSD.ORG  Thu Feb 26 09:27:32 2015
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Date: Thu, 26 Feb 2015 04:27:31 -0500
Message-ID: <CAD2Ti29SC=mX4Om449fBbSUJPueW2zx5NcnqY2XaJoAanL-AWQ@mail.gmail.com>
Subject: RNG's available in disk devices
From: grarpamp <grarpamp@gmail.com>
To: cryptography@metzdowd.com
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Cc: freebsd-hardware@freebsd.org
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FYI, recently released disk drives on the market may
include an onboard 32-byte hardware RNG that can
provide bits to the host for its own use upon request
via the usual command channel per TCG Opal Storage
Specifications.

http://www.trustedcomputinggroup.org/files/resource_files/B15F1F8F-1A4B-B294-D03F09D5122B21F6/Opal_SSC_2%2000_rev1%2000_final.pdf