HD DVD is short for High-Definition/Density DVD. The format is a kind of DVD that will hold up to 30GB, depending on what kind of layer it is, and has been a competitor to blu-ray discs.
And HD dvd is a dvd that has it's movie or TV show in HD format, compatible with any plasma or HDTV. Similar to a Blu-Ray dvd, it can store huge amount a data.
An "upscaling" DVD player will have an HDMI output, as will a Blu-Ray player and an HD-DVD player (although HD-DVD is a dead format now).
Yes, however it won't be stored in native DVD format.
The introduction of high definition discs saw two formats launched. Bluray is one and HD DVD was the other. The format war was won by the Bluray system and HD DVD was withdrawn in 2009. Both Bluray and HD DVD are high definition players but note that "HD DVD" is the name of the format and is confusingly close to the generic description of high definition disc players. Bluray and HD DVD are not compatible so a disc of one type will not play on the other format. There are a handful of dual format disc players but they were expensive and few were sold. If you have HD DVD discs then you need to hand on to an HD DVD player if you want to watch them. All high definition discs on sale now are Bluray and of course will need a Bluray player to play them.
HD DVD (short for High-Definition/Density DVD) is a discontinued high-density optical disc format for storing data and high-definition video.[1] Supported principally by Toshiba, HD DVD was envisioned to be the successor to the standard DVD format. However, in February 2008, after a protracted high definition optical disc format war with rival Blu-ray, Toshiba abandoned the format, announcing it would no longer develop or manufacture HD DVD players or drives.[1] However, the HD DVD physical disk specifications (but not the codecs) are still in use as the basis for the CBHD (China Blue High-Definition Disc) formerly called CH-DVD. The HD DVD Promotion Group was dissolved on March 28, 2008.[2]Because all variants except 3× DVD and HD REC employed a blue laser with a shorter wavelength, HD DVD could store about 3⅕ times as much data per layer as its predecessor (maximum capacity: 15 GB per layer instead of 4.7 GB per layer).FROM::: http://en.wikipedia.org/wiki/HD_DVD
HD-DVD
There are three storage formats for video discs: A DVD will carry standard definition video and will be described simply as "DVD". DVDs can be played on standard definition DVD players as well as either of the HD disc players mentioned below. Regardless of the player used, the image will always be standard definition. HD DVD is one of the two HD disc formats. The disc will be described as an "HD DVD". This format was withdrawn in 2009 when Bluray won the HD format war. HD DVD players and discs are still around but none are sold commercially now. These discs can only be played on HD DVD players. Bluray is the other HD video disc format. They will always be described as "Bluray". They can only be played on Bluray players and will not operate on standard DVD players. Nor will they play on an HD DVD player. Note: HD DVD is the product trade name of the now defunct high definition disc format. It is also commonly used in reference to an disc that supports high definition video. Therefore, is it sometimes used as a reference to Bluray. Although Bluray is a high definition DVD, it is NOT an "HD DVD". As the HD DVD format moves into the history books of television, the term is used more and more to refer to Buray even though it is strictly not the correct term.
In 2008 the Xbox 260 HD DVD player was discontinued due to the rival Blu-ray disc format. The Blu-ray format was carried by the rival Playstation 3 console and proved to be far more successful than HD DVD.
To play a high definition DVD, you need a high definition DVD player. There are two types available currently. HD DVD, developed by Toshiba is one and BluRay, developed by Sony is the other. They are not compatible, so an HD DVD will not play on a BluRay player and a BluRay disc will not play on an HD DVD player. BluRay looks like it is the winner in the format war between the two companies over the last years so it is likely that Toshiba's format will disappear in the coming months. Note that HD DVD can refer to the Toshiba format but it can also refer to high definition DVDs in general.
Toshiba - Paras Dorle
Bluray and HD DVD are the two trade names for high definition discs and players. Bluray is by far the better choice for the simple reason that HD DVD was withdrawn in 2009. Bluray had won the HD format war so HD DVD quietly left the stores. There are a number of HD DVD discs around as well as the players. As the two systems are in-compatible, don't trash your HD DVD player just yet. It will still do a do job of playing the HD DVD discs you still have.