What's unique about this HD DVD, is it is a double sided disc. On side 1 is the HD DVD version of the movie. On side two is a standard DVD version. That means even if your not a serious HD DVD collector, you could own this for the fin and novelty of it, while still having the option to watch the movie. Please note that if you want to play the HD DVD side of the disc, you will need an HD DVD player. The HD DVD was a format that briefly competed with the Blu-Ray to be the next generation of discs for movies and TV shows. Ultimately the Blu-Ray won the format war.