The track pitch or spacing on a DVD is 0.75 micrometers, while the track pitch on an HD-DVD is 0.40 μm. This enabled the tracks to be closer together. The pits on an HD-DVD are smaller than those of a conventional DVD. These more advanced standards enable higher-quality video and smaller file sizes. An HD-DVD player can use either MPEG-2 or the more extensive MPEG-4 Advanced Video Coding and VC-1 video compression standards. DVD players reproduce data from disks that use the MPEG-2 data compression standard. Blue lasers have a larger storage capacity and enable higher resolution than red lasers. HD-DVDs use 405 nanometers in the visible blue range compared with 650 nm in the visible red range for a conventional DVD. HD-DVD disks are able to store more data than a conventional DVD because of the following features: The player reads data from the sensor as digital signals. HD-DVD technology uses a blue laser to read the opposite side of the pits and reflect the laser's light to a sensor. The disks store data using a series of microscopic pits. HD-DVD is based on the Advanced Optical Disc technology that Toshiba and NEC developed in the early 2000s. That is more than enough to accommodate digital TV signals, which are transmitted at 24 Mbps. The data transfer rate of an HD-DVD drive is approximately 36 megabits per second (Mbps). A single-layer HD-DVD stores up to 15 GB of storage capacity, and a dual-layer disk provides up to 30 GB.Ī double-layer HD-DVD can store up to eight hours of 1,125-line high-definition television ( HDTV) programming or up to 48 hours of standard-definition television programming. A standard single-sided, one-layer DVD can hold 4.7 gigabytes of data and 8.5 GB if it's a double-layer disc. HD-DVD (high-definition DVD) is a defunct high-capacity optical storage medium that was once seen as the successor to the DVD.
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