Digital Versatile Disk is the DVD Full Form, it also be known as Digital Video Disk is an optical disc storage format used to store high capacity digital data like high-quality videos, software, operating software, and computer files. DVDs provide higher storage capacity than CDs (compact disc) and can be played in multiple types of players like DVD players. DVD differs from a compact disk (CD) in aspects such as data holding capacity and structural formation.
DVD Full Form
The DVD was initially developed as a substitute for VHS tapes, but soon they became popular as a data storage device. Audio CD was developed in 1972, as a medium of entertainment. In 1993, two video disc formats were developed, the Multimedia Compact Disc (MMCD) and the Super Density (SD) disc, DVD took over CD as a medium of entertainment and data storage in 1997.
Structure of a DVD
- The DVD has several layers of polycarbonate plastic pieces with a total thickness of 1.2 millimeters. There will be also some microscopic bumps and pits on the layers. The bumps and pits are covered with the help of a reflective aluminum layer at the inner layer of the plastic. Their outer layers are protected with the help of a very thin layer of semi-reflective gold. The top layer has a coating of lacquer which is strongly bound with the help of infrared light.
DVD Storage Capacity
DVD can be divided into 4 types based on storage capacity:
- Single-sided, Single layer- 4.7 GB
- Single-sided, Double layer – 8.5 GB to 8.7 GB
- Double-sided, Single layer – 9.4 GB
- Double-sided, double layer – 17.08 GB
Physical measurements of a DVD
A DVD comes in two dimensions. 12 cm (120 mm): It is the most common size and generally used for storing software, movies, and operating system etc. 8 cm (80 mm): This size of DVDs is generally used for small devices like a portable music player and video camera etc.
A DVD can be categorized in the following ways based on applications:
- DVD-ROM: It can only be used for reading and cannot be written.
- DVD-R: It can be used to record any type of data.
- DVD-RW: It can be read, written, erased and rewritten.
DVD drives are devices that can read and write DVDs on a computer. DVD players are devices that do not require a computer to work and can read DVD-Video and DVD-Audio.
The longevity of a Digital Versatile Disc, full form of DVD is measured by how long the data remains readable from the disc, that is, how long the disc can be stored until data is lost. Numerous factors affect longevity: composition and quality of the media (recording and substrate layers), humidity and light storage conditions, the quality and medium of the initial recording, etc. A lower temperature and RH is suitable to extend the life of stored data.
Advantages of DVD
- The picture quality is far better than a CD.
- Most DVD’s have Dolby Digital or DTS. Thus the clarity of the sound will be nearly equal to that in a theater.
- The DVD has a special on-screen index quality which helps you to take a closer look at important scenes of a movie which was earlier indexed by the publisher of the movie. This method is not common.
- The format of a DVD can be changed according to the required type of view. It can be a standard TV size format or a wide-screen TV format.
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