CD+ROM+and+DVD+ROM

**__CD ROM__**
CD ROM (Compact Disk Read Only Memory) is a compact disk that contains data accessible to a computer for data storage and music playback.CD ROMs are popularly used to distribute computer software, including games and multimedia applications, though any data can be stored (up to the capacity limit of a disc). Some CDs hold both computer data and audio with the latter capable of being played on a CD player, while data (such as software or digital video) is only usable on a computer

__**Capacity**__ CD ROM capacities are normaly expressed with "0s and 1s" (binary numbers), a standard 120mm CD 700mb.

CD ROMs are the same as audio CDs, data is also stored in a similar manner. Disks are made from 1.2mm thick of polycarbonate plastic and a thin layer of alluminium to make it smooth and reflective. The most common size of CD-ROM disc is 120 mm in diameter, though the smaller mini CD standard with an 80 mm diameter, as well as numerous non-standard sizes and shapes (e.g., business card-sized media) are also available.
 * __Structure and Appearence__**

__**DVD ROM**__
DVD ROM (Digtal Versatile Disk Read Only Memory) is a media storage disk that resembles closely to a compact disk but holds six as much data. Its main uses are also video storage and data storage. Capacity__** A DVD ROM supports disks that can hold up to 2GBs to 17GBs.
 * __[[image:money_dvd_rom_specialty_graphic_02.jpg width="192" height="238"]]