The Start 

How  does they work 

How they are made

They future

History

The diference between CD &  DVD

What is aCD ROM

CD ROM introduction

Index

The Compact Disc was launched in 1982 for high quality digital audio and has become one of the most successful examples of consumer electronics technology. A year after the CD audio specification was extended to CD-ROM for computer 
applications and was subsequently extended to CD-interactive (CD-I), Photo CD, Video CD, CD Extra and other formats all based on the audio compact disc format.

Despite the introduction of DVD, the CD is likely to remain the dominant format for music for some time to come.

In November 1984, Denon, Hitachi, and Philips demonstrated prototype CD ROM drives with promises of production quantities to be delivered in the first quartet of 1985.The first commercial CD ROM disc was in final preparation by the library corporation. 1985 through 1987 were year of learning, testing, and reasonable growth for this newly introduced optical read only storage media.

Just as the first  year for CD ROM centered around getting used to having so much textual data on a12-cm disc, the second year focused on retrieving and displaying the data, also the generation of this technology-based on the DVD format will. The third year  firms attempted to combine text with image and audio. 

The history of Compact Disc is not very long. In fact, many of the people who helped start the industry are still active in it. Over the last 16 years there have been many advances in CD disc manufacturing technology, resulting in lower manufacturing costs, higher yields, faster cycle times, reduced energy, smaller machines and improved services to the customer. 

In addition, DVD disc manufacture requires new equipment for nearly all stages of the manufacturing process. There are two basic types of data that reside on a compact disc: audio and visual data, which degrades gracefully; and text and computer data, which does not. Graceful degradation means that the data is not rendered inaccurate or unusable by uncorrected errors. A missing byte of information does not make much difference in audio or visual data. A one-bit error in text or computer information, however, could change a letter of text or crash a program.

Ten major electronics companies plan to unveil a range of DVD products, including DVD movies player and DVD ROM drives early in 1997.

Despite the introduction of DVD and DC is likely to remain the dominant format for music some time to come. A video made for a DVD player, for example might not only store an entire movie but also offer viewers choices between camera angles, plots or sound track languages as well.