TheKeyboardDemon: both HD DVD and BD have 5/9 formats in their spec. What it means is taht in order to be an HD DVD player or a BD player it must have red laser and be able to read data off a DVD disk. Even though neither HD DVD or BD require DVD movie playback, they need to read DVDs and everything else is already there (MPEG-2 DD/DTS....) so it is almost a 0 cost toi add DVD movie playback. That is why all HD DVD and BD players will play DVDs your collection is safe from that perspective with either format