What is Digital Video Disc ?

But there are regional houses as well

They will feed the information from my disc

what is called a burner, which guides the laser that brands a glass-topped DVD

data pattern of dots that vary in terms of spacing and in terms of brightness and darkness

DVD player in the same way that the variety of shapes and spacing of these letters

Then, a photograph is taken of this master DVD

DVD digital video disc is a technology based on optical data storage similar to compact disc

The pits and the separations between pits, called lands, vary in length to represent the digital information

The pits are arranged in a track that forms a spiral pattern on the recording

The disc revolves in a circular motion inside

The laser beam is reflected back to a detector

A DVD can store over two hours of video on one layer of the disc.

The smaller pit size on a DVD means the laser beam used in a DVD player must have a shorter wavelength than that in a CD player.

With such small pit areas, the number of possible errors in reading the disc is limitless.

This same method is used for error correction in DVD technology.

The greater amount of information stored on a DVD video is chiefly due to the smaller pit size and tighter track spacing

The Moving Picture Experts Group has come out with an advanced video compression

This development is based on temporal compression that compares each frame of video

which takes images and finds their frequency and then compresses any repetitive frequencies.

Video compression allows more room to store additional viewing options, a big part of what makes DVD

Another big improvement of DVD video storage is its 525-line resolution

That said, DVDs and CDs are not impervious

Because data is stored in a spiral fashion, users should avoid wiping the disc

disc in a circular motion; when cleaning a disc, wipe from the inside radially out to the edge

Compared to video tapes, the longevity and easier storage of DVDs makes them a much more reasonable and user-friendly media.