On Thu, Jul 24, 2003 at 12:07:22PM -0400, Brian Rose wrote:
> 
> I am trying to back up a copy protected CD so when my kids inadvertantly 
> destroy it, I will be able to still play my game.
> 
> I found that I could read in the CD, but the image is imperfect. This stems 
> from the fact that the manufacurer introduced intentional defects into the 
> image. By default, dd fails at the first bad block. Even when instructed to 
> continue upon an error, dd does not pass along bad blocks. If a I/O error 
> occurs for a given block, dd inserts a complete, and valid block of NULLs. 
> This has the effect of changing the image (and the size, checksum, etc) and 
> rendering the disk unuseable, because the validation software is looking 
> for the errors.

I'm guessing this is a PC/Windows game that you're trying to backup.

Do some googling, check the warez sites.  Many games have underground
patches to remove the orignal CD requirement.

Next, have you considered trying Windows to copy the CD?  There is
a program for Windows that will do raw CD copying, BlindRead/BlindWrite
(www.blindwrite.com).  It only works with some CD burners, but they
offer a free trial download for you to see if it will work with
your system.

-- 
Michael Parson
mparson@bl.org


The small print:

I'm not an advocate of Windows, I just believe in using the tool
that can get the job done.  In this case, no one has been able to
demonstrate how NetBSD can solve this problem for him.  Maybe this
will motivate someone to write a tool that does the job. ;)