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CDs

CDs. By: Zach LaPorte. What’s a CD?. Stands for Compact Disc An object that stores digital data Later versions include CD-ROMs, DVDs, HD DVDs, and Blu-Ray. CDs. James T. Russell invented the CD in 1965 Mass production of CDs and players were started in 1982 by Sony and Philips

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CDs

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  1. CDs By: Zach LaPorte

  2. What’s a CD? • Stands for Compact Disc • An object that stores digital data • Later versions include CD-ROMs, DVDs, HD DVDs, and Blu-Ray

  3. CDs • James T. Russell invented the CD in 1965 • Mass production of CDs and players were started in 1982 by Sony and Philips • Only had Audio

  4. CD-ROMs • First made in 1984 • Can place various types of data • Can hold hold about 700 MB

  5. DVDs • Stands for Digital Versatile Disk • DVDs came out in 1996 in Japan • Replaced VHS in 2003

  6. HD DVD • Launched in 2006 by Toshiba • Became obsolete after a rivalry with Blu-Ray

  7. Blu-Ray • Launched by Sony in 2006 • Replaced HD DVD after 2 year rivalry

  8. Parts of a CD

  9. How a CD works • Files are stored from the center of the disk to the outside of the disk • Lasers in the reader read the pits in the CD that are 125 nanometers deep • Laser is 780 nanometers wide

  10. How CDs work Pt.2 • CD data is put in a spiral • The pits are 0 in binary code

  11. Parts of a CD Player/Drive

  12. How DVDs work • Works a lot like a CD, but holds more data • Different types of DVDs hold different amounts of data • Laser is 650 nanometers wide

  13. How HD DVD work • Works like CDs and DVDs, but holds more memory and uses a smaller and different laser then DVD players • Can hold up to 30 GB of data

  14. How Blu-Ray Works • Works like all the others, but holds more data • Blu-Ray players use a blue laser that is 405 nanometers thick

  15. Some CD manufacturers • Sony • Philips • Toshiba • Panasonic • Maxell

  16. Sources • http://electronics.howstuffworks.com/ • http://www.sony.net/Fun/SH/1-20/h5.html • http://www.didyouknow.org/dvd/dvdhistory.htm • http://www.pcworld.com/article/142584/hd_dvd_vs_bluray_disc_a_history.html

  17. The End

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