Thanks for the above information, most helpful. I'll check that I've done the code properly, but I do get "Verification Successful" messages already.
The results of the burn could be used for legal evidence. It would be good to know how the verification is done, so I can quote (if asked) the likelihood of the verification failing to pick up something wrong with the burn. Perhaps this is something I should address to your head office?
I really want to avoid duplicating the verification done by Nero, and absolutely want to avoid a byte by byte comparison of a CD full of files against the source files!