DVD ROM

DVD ROM is the Digital Versatile Disk — Read Only Memory, or DVD-ROM, is a media storage disk that nearly resembles a CD or compact disk.The main difference With CD is that it can formatted highly.Small CD has the capacity of 650 megabytes.And the smallest DVD has the capacity to store 4.38 gigabytes(GB)So that it can be used most widely nowadays rather then A small capacity CD.A DVD-ROM encodes data in the form of a spiraling trail of pits and lands separated by mere nanometers. The trail starts at the center of the DVD-ROM and winds around countless times until it reaches the outer edge. In the case of a double layer disk, the trail continues on a second layer of material. If the disk is also double-sided, the trail of pits and lands extends to side two.