Hmm, Yes that was truth to older models of DVD roms. Newer models, and I can be mistaken, do have unified regional settings. <img src="/ubbthreads/images/graemlins/think.gif" alt="" />
But, sure, Jolie check if you can change regional settings in DVD rom options. Give it a try, at least you will know for sure.
About model and manufacturer, how does Windows recognizes it? As something unknown? Look into hardware profiles, what is written there?