DVD is an optical disc storage media format that can be used for storing data, including movies with high video and sound quality. DVDs resemble compact discs: their physical dimensions are the same-12cm or the mini 8cm-but they are encoded in a different format and at a much higher density. Unlike CDs, all DVDs must [...]

High definition DVD, also known as HD-DVD (which actually stands for High Density DVD), is one of two competing high definition storage format – the other being Blu-ray. The need for a new, high capacity storage format, has been primarily brought about by the rapid rise in popularity of HDTV in Japan and the US. [...]