what is dvd9

[snake2]

thanks for answering and i did not realy want to know how to copy xbox games i was just wondering if they were dvd9. so thanks for telling me, and why is it not all chips will load dvd9 imports.

ps:
me and my brother are having a fight so maby someone can put a end to it i say ALL ps2 even v1 can read dvd9 he says only the newer one can help