Here's why I ask. I'm preparing to write some software for the testing of optical drives for a computer recycling organization. To test CD write function, my plan is to write a session that (including lead-in and lead-out) is about 1/20th of the space on disc, then verify that it was written correctly. This allows each disc to test 20 drives before it must be blanked, and evens the wear of the rewritable layer across the entire surface of the disc.
I'd like to do something similar with DVD-RW or DVD+RW media. Anybody have any suggestions?