On Sun, 2006-07-02 at 14:58 -0400, Jay R. Ashworth wrote:
> On Sun, Jul 02, 2006 at 01:04:55PM +0100, Drew wrote:
> > When cdrdao reports the capabilities of the drive it say this:
> > 
> > Raw P-W sub-channel reading (audio track) is supported.
> > Cooked R-W sub-channel reading (audio track) is supported.
> > 
> > You notice it says "cooked R-W" NOT "cooked P-W"
> > 
> > Does this mean it's excluding the p and q channels? that would mean it
> > is returning 6 out of 8 subcode bits which would account for the subcode
> > only being 72 bytes and not 96 (3/4 of the size). How it would arrange
> > these 6 bit I don't know.
> 
> I entirely think it could mean that, yes, and it would probably
> just bit-pack them.  Recording some identifiable data, as you have, and
> checking to see what comes back on a bit-by-bit basis would probably
> prove it.


Well I haven't got that drive but I'll post my subcode injection program
and Kelvin can try it if he wants.

It's a pretty simple program. You need to start off with a .bin image of
a disk read in RW_RAW mode (cdrdao). Then you just run:

$injector <file_name>

where <file_name> is the name of the .bin image.

The program will then over write the lower nibble of each subcode byte.
The values it writes are 0 to F (in hex).

You can then burn the image back to a disk and try extracting it in RW
mode 

To compile the source just extract the archive:

$tar xjvf injector.tar.bz2
$cd injector

Then run the compile script

./compile.sh

All this assume linux and gcc.


Drew

Attachment: injector.tar.bz2
Description: application/bzip-compressed-tar

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