From owner-freebsd-geom@FreeBSD.ORG  Fri Feb  4 17:43:25 2005
Return-Path: <owner-freebsd-geom@FreeBSD.ORG>
Delivered-To: freebsd-geom@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id D7E5916A4CE
	for <freebsd-geom@freebsd.org>; Fri,  4 Feb 2005 17:43:25 +0000 (GMT)
Received: from out1.smtp.messagingengine.com (out1.smtp.messagingengine.com
	[66.111.4.25])	by mx1.FreeBSD.org (Postfix) with ESMTP id 7FD0043D1D
	for <freebsd-geom@freebsd.org>; Fri,  4 Feb 2005 17:43:25 +0000 (GMT)
	(envelope-from list-freebsd-2004@morbius.sent.com)
Received: from frontend2.messagingengine.com (frontend2.internal
	[10.202.2.151])
	by frontend1.messagingengine.com (Postfix) with ESMTP id 350D3C54726
	for <freebsd-geom@freebsd.org>; Fri,  4 Feb 2005 12:43:24 -0500 (EST)
X-Sasl-enc: oi9GYgqlqShxvO9M92SMpQ 1107539003
Received: from gumby.localhost (dsl-80-41-107-215.access.as9105.com
	[80.41.107.215])
	by frontend2.messagingengine.com (Postfix) with ESMTP id 63337570159
	for <freebsd-geom@freebsd.org>; Fri,  4 Feb 2005 12:43:23 -0500 (EST)
From: RW <list-freebsd-2004@morbius.sent.com>
To: freebsd-geom@freebsd.org
Date: Fri, 4 Feb 2005 17:43:18 +0000
User-Agent: KMail/1.7.2
MIME-Version: 1.0
Content-Disposition: inline
Content-Type: text/plain;
  charset="us-ascii"
Content-Transfer-Encoding: 7bit
Message-Id: <200502041743.21047.list-freebsd-2004@morbius.sent.com>
Subject: Encrypted DVDs beyond 2GB
X-BeenThere: freebsd-geom@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: GEOM-specific discussions and implementations
	<freebsd-geom.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-geom>,
	<mailto:freebsd-geom-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-geom>
List-Post: <mailto:freebsd-geom@freebsd.org>
List-Help: <mailto:freebsd-geom-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-geom>,
	<mailto:freebsd-geom-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 04 Feb 2005 17:43:26 -0000

Some time ago I asked about creating encrypted data CDs, and someone suggested 
using mdconfig to create a file backed md device, encrypted with gdbe, and 
then burning the backing file to CD. 

That all works fine, but when the same technique is tried on DVDs, you run 
into the problem that FreeBSD 5.3 can't handle a file bigger that 2GB on an 
iso9660 filesystem. If you install the development version of mkisofs, it is 
possible to burn a DVD containing a file of up to 4GB. Windows 98 can read 
the file off the disk, but FreeBSD can't do anything with it.

Using 2 files and having the data mounted at two separate points would be a 
bit clumsy. Does anyone have  a better idea?