On Fri, 2006-06-30 at 00:33 +0100, Kelvin Lawson wrote:

> I've just compared the RW vs RW_RAW output from my drive, and it appears 
> that the RW version has 72 byte CDG sections vs 96 bytes for RW_RAW. I 
> initially thought that must be the 96 bytes of CDG data without the 24 
> parity bytes, but it turns out that strangely the drive is returning 
> only the first 3 24-byte CDG packets (including the parity bytes), and 
> missing the fourth. So it's only giving me 3 out of every 4 CDG packets 
> in RW mode. It also happens to swap the bytes in every 16 bit word.
> 

Kelvin, I've just had a thought.

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.

Could this explain what you are getting from your drive?

Drew.



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