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. HDTV has much higher bandwidth  than either NTSC  or regular DVD discs, so in order to record programs from HD- DVD higher capacity discs, of at least 30GB, are required.

HD-DVD was developed by Toshiba and NEC and has the support of the DVD Forum,  along with a number of Hollywood studios. Currently those studios which have  announced support for HD-DVD are; Universal Studios, Paramount Studios, Warner  Bros., and New Line Cinema. It has a capacity of 15GB for single-sided discs and  30Gb for double-sided. It doesn't need a caddy or cartridge and the cover layer is  the same thickness as current DVD discs, 0.6mm. The numerical aperture of the  optical pick-up head is also the same as DVD, 0.65mm.

Because of its similarities to current DVD, high definition DVD is cheaper to  manufacture than Blu-ray, because it doesn't need big changes in the production  line set-up. Both HD-DVD and Blu-ray have backward compatibility with existing  DVDV discs. That is that current DVDs will play in HD-DVD player, although new  high definition DVD won't play in custom tin can older DVD players.

High definition DVD currently supports a number of compression formats, including  MPEG-2, VC1 (based on Microsoft's Windows Media 9), and H.264 which is based on  MPEG-4 and will be supported by the next version of Apple's QuickTime software,  which will be included with Mac OS X  Tiger.

Thinking through these factors will help you get the right storage the first time.  But just in case, whatever you buy, make sure it's returnable.  Even the best shoppers sometimes get something home and find it just doesn't work.

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