___ ___ How compact disc were made How thevinly lp switched History on the compact disc Introduction about cd What a compact disc is used for why we need compact disc

CDs are everywhere these days. Whether they are used to hold music, data or computer software, they have become the standard medium for distributing large quantities of information in a reliable package. Compact discs are so easy and cheap to produce that America Online sends out millions of them every year to entice new users. And if you have a computer and CD-R drive, you can create your own CDs, including any information you want. In this article, we will look at how CDs and CD drives work. We will also look at the different forms CDs take, as well as what the future holds for this technology.

The compact disc in the early 1980 James which Russell made the compact disc is also called cd. Russell lived in America and he actually made the compact disc in 1965.he was enthusiastic in music and was told that there were better ways to music than the vinyl lp which was very noisy and wore out after repeating in self over and over again. The brand new cd first demonstrated in 1997,and the new music hit the shops in 1982 it was good form the start and over ten- years ago sales of the vinyl went off the track and switched to the compact disc.

Making a compact disc involves first preparing a glass "disc master." This master is then encoded with the desired information and put through a series of electroforming steps. In electroforming, metal layers are deposited on the glass master using electric currents. When the final master version is ready, its information is transfered onto a plastic disc. A reflective aluminium layer is applied, followed by a clear acrylic protective layer, and finally the label.

The Compact Disc (also known as a CD) is an to store. It was originally developed to store and playback sound recordings exclusively, but later expanded to encompass data storage write-once audio and data storage rewritable media), Video Compact Discs, Super Video Compact Discs (Photos', Pictured, CD-i, and Enhanced CD. Audio CDs and audio have been commercially available since October Standard CDs have a diameter of 120 millimetres (4.7 in) and can hold up to 80 minutes of uncompressed audio or 700 of data. The has various diameters ranging from 60 to 80 millimetres (2.4 to 3.1 in); they are sometimes used for CD singles, storing up to 24 minutes of audio or delivering CD-ROMs and CD-s remain widely used technologies in the. The CD and its extensions are successful: in 2004, worldwide sales of CD audio, CD-ROM, and CD-R reached about 30 billion discs. By 2007, 200 billion CDs had been sold Discs are increasingly being replaced or supplemented by other forms of digital distribution and storage, such as downloading and, with audio CD sales dropping nearly 50% from their peak in 2000.