Everything about hi-tech equipment


What are HD DVD players?

HD DVD, High Density DVD, orapplied to current red laser DVDs in 5,
High-Definition DVD is a high-density9, 15 and 18 GB capacities which offers
optical disc format designed for thea lower-cost option for distributors,
storage of data and high-definitionthis type of disk is often called 3x DVD
video.as it has three times the bandwidth of
Historyregular DVD video.
The HD DVD disc is designed to be theLike the original DVD format, the data
successor to the standard DVD format. Itlayer of an HD DVD disc is 0.6 mm below
can store about three times as much datathe surface. The numerical aperture of
as its predecessor. (15 GB per layerthe optical pick-up head is 0.65,
instead of 4.7 GB) The HD DVD standardcompared with 0.6 for DVD and 0.85 for
was jointly developed by a group ofBlu-ray aperture. Both of the new
consumer electronics and PC companies,formats are backward compatible with
spearheaded by Toshiba. On November 19,DVDs and both employ the same video
2003, the DVD Forum voted to support HDcompression techniques: MPEG-2, Video
DVD as the HDTV successor of theCodec 1 (VC-1) and H.264/MPEG-4 AVC.
standard DVD. At this meeting, they alsoFile systems
renamed it HD DVD. The format hadLike previous optical disc formats, HD
previously been called the "AdvancedDVD supports several file systems, like
Optical Disc" (AOD).ISO 9660 and Universal Disk Format
At CES 2006, Microsoft announced that(UDF). Currently, all HD DVD titles use
there would be an external add-on HD DVDUDF version 2.5 as the file system, the
drive for the Xbox 360 game console;same one used for Blu-ray releases.
this was released in November 2006. AlsoAudio
at CES [1]2006, companies backing HD DVDHD DVD can be mastered with up to 7.1
said that nearly 200 titles would bechannel surround sound using linear
available for the format by the end of(uncompressed) PCM, Dolby Digital, Dolby
the year.Digital EX, DTS and DTS ES formats also
On March 31, 2006, Toshiba releasedused on DVDs. In addition, it also
their first HD DVD player in Japan atsupports Dolby Digital Plus and the
Y110,000 ($934).[2] HD DVD was releasedlossless formats Dolby TrueHD and DTS
in United States on April 18, 2006,[3]HD. Currently, most DVD movies are made
with players priced at $499 and $799.with 5.1 channels of surround sound.
The current specification version for HDThere are relatively few titles that
DVD-ROM and HD DVD-Rewritable is versionoffer 6.1 channels of surround sound. On
1.0. The specification for HD DVD-R isHD DVD the Dolby formats are mandatory,
currently at 0.9. The first HD DVD-ROMmeaning that a Dolby Digital, Dolby
drives were expected to be unveiled byDigital Plus or Dolby TrueHD track may
Q4 2006, with mass production to startbe used as the sole soundtrack on a
in Q1 2007. The actual product launch ofdisc, because every player will have a
both CE and PC units occurred in latedecoder that can process any of these
2006. As of December 2006, more thanbitstreams. For lossless audio in movies
120,000 HD DVD's had been sold in thein the PCM, Dolby TrueHD or DTS-HD
United States.[citation needed]formats, HD DVD discs support encoding
As of February 2007, HD DVD is in ain up to 24-bit/192 kHz for two
format war with Blu-ray Disc.channels, or up to eight channels of up
Technical specificationsto 24-bit/96 kHz encoding. For
Hardwarereference, even new big-budget Hollywood
HD DVD has a single-layer capacity of 15films are mastered in only 24-bit/48
GB and a dual-layer capacity of 30 GB.kHz, with 16-bit/48 kHz being common for
There is also a double-sided hybridordinary films.
format which contains standard DVD-VideoVideo
format video on one side, playable inThe HD DVD format supports a wide
regular DVD players, and HD DVD video onvariety of resolutions, from
the other side for playback in highlow-resolution CIF and SDTV, all video
definition on HD DVD players. Theseresolutions supported by the DVD-Video
hybrid discs make retail marketing andstandard, and up to HDTV formats such as
shelf space management easier. This also720p, 1080i and 1080p.[6] All movie
removes some confusion from DVD buyerstitles released so far have had the
since they can now buy a disc compatiblefeature encoded in 1080p, with
with any DVD/HD DVD player in theirsupplements in 480i or 480p. Most titles
house. The HD DVD format also can beare encoded with VC-1.



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