The full form of HD-DVD is High Definition/Density Digital Versatile/Video Disc. It’s used on Computing ,Data Storage in Worldwide

HD DVD is short for High Definition Digital Versatile Disc, which is an outdated high-density disc format used to store data and playback of high-definition video. Mainly supported by Toshiba, HD DVD was considered the successor of the standard DVD format.

On February 19, 2008, after a protracted format war with its competitor Blu-ray, Toshiba abandoned the format and announced that it would no longer produce HD DVD players and drives. The HD DVD Promotion Group was disbanded on March 28, 2008.

The HD DVD physical disc specification (rather than the codec) was used as the basis for the China Blue High-definition Disc (CBHD), previously known as CH-DVD.

Because all variants except 3× DVD and HD REC employed a blue laser with a shorter wavelength, HD DVD stored about 3.2 times as much data per layer as its predecessor (maximum capacity: 15 GB per layer compared to 4.7 GB per layer).

In the late 1990s, commercial HDTV sets started to enter a larger market, but there was no inexpensive way to record or playback HD content. jvc’s D-VHS and sony’s HDCAM formats could store that amount of data but were neither popular nor well-known. It was well known that using lasers with shorter wavelengths would yield optical storage with higher density. Shuji Nakamura invented practical blue laser diodes, but a lengthy patent lawsuit delayed commercial introduction.

Since all variants except 3x DVD and HD REC used blue lasers with shorter wavelengths, the amount of data stored in each layer of HD DVD is about 3.2 times that of its predecessor (maximum capacity: 15 GB per layer, while each layer 4.7 GB).

History

• In the late 1990s, commercial HDTV machines began to enter a larger market, but there was no cheap way to record or play HD content.
• In August 2002, Toshiba and NEC announced their competing standard Advanced Optical Disc. It was adopted by the DVD Forum and renamed HD DVD the following year.
• On March 31, 2006, Toshiba released their first consumer-based high-definition DVD player in Japan for 110,000 yen (US$934).
• In mid-2007, the first batch of HD DVD recorders was released in Japan.
• On February 19, 2008, Toshiba announced that it would no longer develop or manufacture HD DVD players and drives, then the HD DVD Promotion Group officially disbanded on March 28, 2008.