DVDs resemble compact discs as their physical dimensions are the same store much more information in a different format.DVD (also known as "Digital Versatile Disc" or "Digital Video Disc") is an optical disc that can be used for data storage, including movies with high video and sound quality.
Who invented it?
The invention of DVD cannot be attributed to any one person or company. Toshiba, Philips, Sony, and Matsushita Electric all had a hand in the technology used to make DVDs. The standards used in creating DVDs are maintained by DVD Forum.
How does it get power?
A DVD player is powered by electricity. It reads the data on the media using a light.
How does it work?DVDs are of the same diameter and thickness as CDs, and they are made using some of the same materials and manufacturing methods. Like a CD, the data on a DVD is encoded in the form of small pits and bumps in the track of the disc. A DVD is composed of several layers of plastic, totaling about 1.2 millimeters thick. Each layer is created by injection molding polycarbonate plastic. This process forms a disc that has microscopic bumps arranged as a single, continuous and extremely long spiral track of data. More on the bumps later.
Each writable layer of a DVD has a spiral track of data. On single-layer DVDs, the track always circles from the inside of the disc to the outside. That the spiral track starts at the center means that a single-layer DVD can be smaller than 12 centimeters if desired.
How dangerous is it?
The dvd is not dangerous by its self unless it is broken
What does it do?
It records digital information that can be accessed/used by a DVD player.
How does it vary?
DVDs are entering the next generation and now there are two new types of DVDs called bluray and HD-DVD.
How has it changed the world?
The DVD has modernized the current generations of video
1 comment:
Its very informative
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