DVDs have become ubiquitous. Whenever we want to watch a movie or listen to some music we reach out for a DVD. Here are some basic facts about the DVD:

What is a DVD?

DVD is short of Digital Versatile Disk. A DVD-ROM closely resembles a CD or compact disk. However, a DVD-ROM is formatted to hold far more data. While a CD commonly has a capacity of 650 megabytes, the smallest capacity DVD can store about seven times more data, or 4.38 gigabytes (GB). A DVD-ROM encodes data in the form of a spiraling trail of pits and lands separated by mere nanometers. There are various kinds of DVDs. The DVD-ROM is the most common. It is a disk that cannot be written over. Blank DVDs with designations like