HD-DVD player can play all formats, CD, DVDs and HD-DVD disc. However it can not play Blu-Ray DVD. Blu-Ray is also another high definition format and is different from HD-DVD.
A normal DVD player cannot play HD-DVD because HD-DVD is a high defintion format.
Just to let you know since April 2008, HD-DVD and Blu-Ray had a war for the past year in 2007 to see which high definition format would likely win and which movie studios would support. Blu-Ray is now the winner and you will see many titles in Blu-Ray format.
HD-DVD is no longer supported by many companies. You will not see many movie titles in HD-DVD any longer in the retail stores. More and more movies are coming out in Blu-Ray.
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