CDDVD - needle made from a diamond, thus the process of...

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Ian Tierson 5/8/2009 Dr. Karim Physics in Modern Technology CDs and DVDs Data Storage has taken many forms over the years. In the distant past, music was stored on rotating black discs made of vinyl called gramophone records, or phonograph records, or just records. Later came 8-track cassettes, which involved a never-ending tape with four stereophonic strips of magnetic media. Then the average cassette tape, with two strips of stereophonic magnetic media that could be flipped over when the end of one side was reached. Then in the early 80’s, a new media was developed. Humankind drifted away from the magnetic media of the past and adapted the newer optical memory of the future. CD’s were a form of rotating optical media that could store more music than a record, and were much smaller and more portable. In addition, the CD did not need to be damaged in order to be used. Phonographs were played using a
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Unformatted text preview: needle made from a diamond, thus the process of playing a record was damaging to the record itself. Magnets, creating inconveniences of storage, easily erased tapes. CDs were practically indestructible. They did not need to be rewound, you could easily jump to a song you liked, and they were easier to store. CD technology works by using a laser, light amplified through specific electron radiation, to create a microscopic dimple in a layer of a disc protected by plastic. Another, weaker, laser can then be used to read and interpret those dimples to play back music. In later years, a disc was developed that allowed a home consumer to write his own data to disc. With this came the advent of document storage on these media instead of traditional floppy discs, as floppies were a magnetic medium and the data storage equivalent of musics cassette tapes....
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This note was uploaded on 04/07/2008 for the course PHYS 113 taught by Professor Karim during the Fall '06 term at St. John Fisher College.

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CDDVD - needle made from a diamond, thus the process of...

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