Digital video disk

Digital Versatile Disk or Digital Video Disk (DVD) is invented The Nobel Prize in Chemistry is awarded to Richard Smalley, Robert Curl, and Harry Kroto for their 1985 discovery of the third form of carbon, known as buckminsterfullerene ( bucky balls ) ... 

Storage on modern systems, if drives for removable disks, writable CDs (compact disks), CD-ROMs (compact disk, read-only memory), DVDs (digital video disk), and magnetic tapes are allowed or there are network connections to servers with large-capacity storage devices where data can be stored, is virtually infinite. 

DVD Digital Video Disk LCD Liquid Crystal Display... 

The optical disk market is a major PC consumer and, according to Bayer Material Science, it accounts for 800,000 tonnes out of a global market of around 2.4 million tonnes. In the UK, compact disks (CD) and digital video disks (DVD) are frequently given away with newspapers and there is a vast market for DVD versions of popular films with the film, Shrek 2 generating worldwide sales of approximately 40 million optical disks. 

Laser diodes are used in a variety of applications. Most bar-code scanners are now based on laser diodes (previously, they used He-Ne lasers). Optical media, such as compact disks (CDs), digital video disks (DVDs), and Blu-ray disks, use laser diodes given the proliferation of personal media devices in many societies, it is understandable that laser diodes are the most common form of laser. Laser diodes are also used in fiber-optic communications. Because they can be made very small (Figure 15.38), laser diodes can be used in applications where other types of lasers are precluded because of space, size, or power limitations. 

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