A little thought about the differences between BIN and CDG files kjzone has found -- it may happen that there are small scratches on the CD that get fixed during the read process using the process called 'jitter correction'. There corrections are unhearable, but may cause a differences in the binary file (a bit or two might be different). As an experiment I would suggest you read the same track twice using the same program and then compared the results. In some cases you will see that there are differences between the files.

I hope this clears the mystery a little.

Eric