Re: Erasing a DVD-/+RW DISC

From: Jan Panteltje (pNaOnStPeAlMtje_at_yahoo.com)
Date: 09/29/03 

Date: Sun, 28 Sep 2003 23:39:09 GMT

On a sunny day (Sun, 28 Sep 2003 17:11:51 GMT) it happened "David Carmichael"
<dec2955@swbell.net.nospam> wrote in
<rDEdb.2221$yR5.829@newssvr23.news.prodigy.com>:

>Your answer scares me... since I use the same four DVD+RW discs
>to create a 'MASTER' disk and then do a disk copy once I know
>that I have fully working menus and no trouble with audio sync.
>
>So you are saying that when I do a disc copy to my DVD+R disc,
>and if the movie is shorter than the movie recorded on the DVD+RW
>before it.. that the DVD+R copy would have parts of the older
>disc on it...
Yes, and it is very easy to extract that data.
In Linux I found out I could just play past the end (into the old stuff)
with mplayer (hit grey arrow keys ->).
Of cause a profi would do (in Linux)
dd if=/dev/dvd of=myhack.mpg bs=2048 skip=STARTSECTOR count=LENGTH
and have the mpegstream of your private home videos (or whatever was on
there).
You could do excellent data hiding in those not used sectors too.
Why should anyone look there?
Security by obscurity, and SOO much space...

>Yet using any of the software based players and or two of my
>set-top boxes the 'erased' disc's were not readable.
They are ALWAYS readable for the curious....
Be careful.
Regards
Jan

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