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Date: Fri, 29 Oct 2010 14:50:17 -0500
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From: Adam Vande More <amvandemore@gmail.com>
To: "Jason C. Wells" <jcw@speakeasy.net>
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Cc: freebsd general questions <freebsd-questions@freebsd.org>
Subject: Re: Recovering a DVD
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On Fri, Oct 29, 2010 at 12:54 PM, Jason C. Wells <jcw@speakeasy.net> wrote:

> I have a back up DVD that I cannot mount.  dd won't read /dev/acd0  with an
> error "dd: /dev/acd0: Input/output error".    Tried dvdisaster but it can't
> find my drive. Any pointers you can offer in getting this data off this disc
> are greatly appreciated.
>

Yeah dvdisaster documentation leaves something to be desired.  A tiny,
unauthorive FAQ is what you're supposed to follow.

http://www.freebsd.org/cgi/query-pr.cgi?pr=149020

On the other hand, you miss understand what dvdisaster is capable of.  It
will not help as you're supposed to use it BEFORE it goes bad.  I would try
Chuck's suggestion first then maybe some physical media repair techniques.
Are you sure the DVD was ever usable?

-- 
Adam Vande More