Xbox 360 HD DVD Add-on Sells 155,000 Units in U.S.The HD DVD Group announced in April that it had sold over 100,000 players in the U.S. in its first year of availability. The numbers only represented standalone players, and did not include sales of HD DVD PC drives or the Xbox 360 HD DVD player. A Microsoft representative told CNET UK that 155,000 Xbox 360 HD DVD add-ons have been sold in the U.S., making it the “biggest-selling accessory” ever sold for the console. By “biggest-selling,” Microsoft may be referring to the overall revenue, as it would seem unlikely that the HD DVD add-on would be more popular than extra controllers. Each HD DVD drive retails for around $200. Even with the combination of standalone HD DVD players and the Xbox 360 add-on, the overall number of HD DVD-capable players is less than the total number of Blu-ray playing machines. The difference between those two, however, is that every HD DVD player or drive is purchased with the intention of playing movies. On the other hand, not every Blu-ray machine is (with the majority of them being PlayStation 3 consoles) purchased for movies. Even though there is more Blu-ray hardware in the hands of consumers, the HD DVD side averages more movies sold per machine. According to CNET, an average of one disc per Blu-ray machine is sold, compared to four discs per HD DVD machine. Nevertheless, overall disc sales for 2007 are still in favor of Blu-ray.