Optical media is what people use every day to listen to music, play movies, load games and lots more. Optical media is the term used for CDs and DVDs.
CDs can hold up to 700 megabytes of storage and DVDs can hold up to 4.4 gigabytes on a single layer and 8 gigabytes on a dual layer disk. To be able to play optical media on your PC you have to have an optical media drive. If you want to play DVDs you have to have a DVD compatible one, these drives have become extremely cheap and most of them now are DVD writer compatible meaning you can write your own data to them.
To get more in depth information on optical media please go to : http://en.wikipedia.org/wiki/Optical_media
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