Re: [Cdrdao-devel] cd-read problem (CVS cdrdao of 01/10/29)

[Giuseppe C. <co...@lu...>]

On Tue, Nov 06, 2001 at 02:31:48PM +0100, Hans-Peter Jansen wrote:
...
> > Can you try to read out the CD with your CD writer?
> 
> This succeeded fortunately, thanks to Guiseppe Corbelli, who
Giuseppe :-)
> 
> Nevertheless, I stumbled over the next 'read-cd' problem.
> 
> It's a mixed mode cd, again. This time, I'am able to succeed the 
> read with --read-raw and a lots of
> 
> WARNING: Found L-EC error at sector 820 - ignored.
> WARNING: Found L-EC error at sector 823 - ignored.
> WARNING: Found L-EC error at sector 842 - ignored.
Every time an uncorrectable error is found default behaviour of most readers
is to slow down. If you own a Plextor drive you can set this.
> This read took more than a hour, but the resulting image does not work :-(
> 
> > May the source CD have some kind of copy protection, i.e. is it
> > a very new CD?
> 
> Oh, well, yes, they have...
> 
> Have you looked at clonecd?
> IFAICS, all they do, is some trickery with error/subchannel handling.
> 
> Would you like to give me some advice, where to dig in the "source"
> and a few words about the big error handling picture.
> Wouldn't we need the machinery to extract the subchannel data first?
> How to reinject the subchannel data to the write stream?
Latest cvs cdrdao has ability to write subchannels, but I don't know if it
already supports reading. I'm either not aware of any external tools to do
this. Maybe I can help writing down an external tool in C, using libscg.

--
  	Giuseppe "Cowo" Corbelli ~\/~ My software: http://cowo.mascanc.net
  -<! Adding features does not necessarily increase functionality -- it just
		makes the manuals thicker. !>-