AGM attendees from Cork; Re: [ILUG] Backing up a CD

[Rik Dunphy]

Martin Feeney wrote:
> 
> On 13 Jun 00, at 13:01, Rik Dunphy wrote:
> 
> > It should be possible to read raw binary data. Red/Yellow book is what you
> > called it, a format. It should be (and as far as I know is) possible to
> > read the raw data from the disk to create a binary image of the disk, by
> > circumventing the formats.
> 
> Have you tried cdrdao with the following:
> 
> cdrdao copy --source-device x,x,x --device y,y,y --buffers 64
> 
> It should be fine with kernel versions >2.2.6.  If you have a kernel version less
> than this you'll need to get the sg-buffer patch (available here:
> ftp://ftp.fokus.gmd.de/pub/unix/cdrecord/alpha/).  Definitely do not use --on-the-
> fly as it'll probably buffer underrun on you.

I tried cdrdao (kernel 2.2.14), but it seems to take forever. It took 2
hours to read about 168Mb from the CD. I can only assume that I didn't use
the right drivers. There seems to be a lot of errors generated when
extracting the audio. Which is funny, since xcdroast extracts the audio
tracks perfectly on a track by track basis.

I tried..
  cdrdao copy --source-device 1,0,0 --source-driver generic-mmc
              --device 1,1,0 --driver generic-mmc
              --datafile /cdimage/disk1
              --speed 2

it then displays the TOC and starts to read track1. But it then takes very
long. Using the --simulate switch seems to add extra information and I can
see that alot of errors are produced (it looks like the sub channel
commands (SCB?)), but I can't seem to fix it.

My source is a Creative 2x DVD-ROM, with the SCSI Emulation enabled.

My writer is a Cyberdrive 602, (6x2x2x), again ATAPI with SCSI Emulation.

I've tried the generic-mmc-raw driver with the same results, and also
adding the options mentioned in the README.
 
> I've used cdrdao this way myself and it works for mixed mode (on a fairly ancient
> CD/RW (HP7200i).
> 
> The latest version of cdrdao (1.1.3) supports reading of CD-TEXT and has a new
> command read-cd which reads all tracks including gap information into a single
> .bin file.

I think I have an older version. I'll download the 1.1.3 and give it a
whirl!
 
<snip>
> 
> Now there are scsi commands to read and write to the subchannels, but if the CD
> drive doesn't support it, then it shouldn't work.  I have no idea how NTI CD Maker
> pro is writing these subcodes if the recorder says it doesn't allow it.

This is why I suspect that CD Maker Pro is simply throwing on the data,
regardless of format, leaving the player to pick up information that it
can.
 
> I would encourage you to get the latest cdrdao and try again (but use a CD/RW for
> your testing as it'll probably take a few attempts to get it to work if it'll work
> at all).  Try setting the device manually to generic-mmc or generic-mmc-raw or
> possibly use the plextor driver.  You might have to muck about with the --read-raw
> switch as well.  I've never needed to copy a CD-EXTRA so I'm not sure what
> settings will work for them.
 
This is my first go at a CD-Extra as well. Data CDs have been easy enough,
and audio has been ok, bar the problem with the CD-Text. At least I think
it's the CD-Text! 

Do you think the plextor driver will work on an ATAPI drive?

Thanks for the help
RikD