Optical+backing+storage+media

= __Optical Backing Storage Media__ =

Backing storage means data storage that retains its contents when the computer is switched off. It can be used to hold both programs and data. A Compact Disc or a CD is a Disk used to store Digital data It was originally developed to store sound recordings CDs have been commercially available since October 1982.CD ROM A Digital Video Disc or DVD, is an Optical disc storage media format, and was developed and invented by Sony Panasonic and Samsung in 1995.DVD ROM

DVDs and CDs are both portable you can transport both from one computer to another a typical CD can hold 700MB while a typical DVD can hold up to 2 to 6GB, as tecnology developed the DVD capacitys increased for example Double sided, Dual layer DVD can hold 17.08GB.