What are Blu-ray and HD-DVD?
HD-DVD and Blu-ray Discs (BD) are two evolutionary formats designed to replace conventional DVDs, and to allow movie fans to enjoy films in high definition, with pictures far more crisply detailed than standard DVDs. Both formats conform to the general dimensions of DVDs and CDs, and hardware manufacturers intend to insure that players will play back the earlier formats, although with no improvement in video or audio performance. HD-DVD players will not play Blu-ray discs, nor will Blu-ray machines play HD-DVD discs.
