June 5th, 2008The Technology Of DVD Media
A Digital Video Disc or DVD is one of the most popular forms of storage media nowadays. It is an optical disc and mainly used to store videos. However, data in any form can be stored on a DVD. The dimensions of a DVD are generally the same as a common compact disc but the amount of data that can be stored is six times greater.
The different variations of DVD are based on the way data is being stored on it. A DVD-ROM has pre-written data that can only be read. A DVD+R and DVD-R are the ones on which the data can be written only once; and on a DVD+RW the data can be written and erased more than once. The lasers used to read DVDs are typically of 650 nm wavelength.
The terms DVD-Audio and DVD-Video discs are DVDs with suitably structured and formatted audio and video content respectively. Other types of DVDs are called DVD-data discs. Read the rest of this entry »
