Re: [Bug-ddrescue] 10 days for 7.8gig?

[Charles Hemingway]

Here's what I've done to rescue my son's scratched dvds (*grumble* son,
these discs aren't frisbees!)

DVDs are typically encrypted. This includes the file system on some
(most?) DVDs. You'll probably be attempting to read it for a long time
and get nowhere. The best way to get the data off an encrypted dvd is to
use mplayer to give the drive the decryption keys, such as mplayer
dvd://1 (for the first chapter, dvd://2 for the 2nd, etc...). Then pause
it, and commence backing up.

Note: This won't remove the encryption on the dump at all, but it does
allow a playable backup of scratched media. If you dumped this raw image
back to a dvd, it shouldn't work in a regular player, because (from what
I've heard) there is secret key data on a readable but non-writeable
portion of the DVD, probably for copy protection.

Hope that helps,
Charles

Olivier Delhomme wrote:
> 2009/1/15 Antonio Diaz Diaz <address@hidden>:
>
>   
>> Try to rescue the dvd on another reader and if the first pass rescues
>> nothing, give up. sorry.
>>     
>
> Hello,
>
> I know that I might not tell you to use something else in this list, but,
> to recover dvds you might try different drives and also different
> software such as dvdisaster (http://dvdisaster.net/en/). You may
> try all combinations...
>
> Cheers,
>
> Olivier.
>
>
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