Overview. CD is standard for installing computer programsUses CD-ROM media (Compact Disk Read Only Memory)650 Mb. capacity compared to 1.44 Mb. for floppy disksPits (holes) and Lands (plateaus) store the data (1s and 0s). http://entertainment.howstuffworks.com/cd1.htm. http://www2.h-net.msu.edu/~filmhis/resources/CD-ROM.gif.
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1. How a CD-ROM Works Bill Holmes
Chandler-Gilbert Community College
2. Overview CD is standard for installing computer programs
Uses CD-ROM media (Compact Disk Read Only Memory)
650 Mb. capacity compared to 1.44 Mb. for floppy disks
Pits (holes) and Lands (plateaus) store the data (1s and 0s)
3. Parts Overview Tray motor
Ejects and pulls in CD tray
Shines light on CD and reads reflection
Spins the CD at various speeds
4. Reading Data From a CD Laser shines light on disk
Pits and lands reflect light differently
Reflected light is picked up by sensor
Sensor changes light to electrical signal for the computer
Motor moves the head to read all parts of the spinning CD.
5. CD Finish CD spins between 200 and 500 RPM depending on position of the head
Faster near center
Slower near edge
That way data comes off disk at same rate
Demo: bottom of http://entertainment.howstuffworks.com/cd2.htm
Clean with soft damp cloth
Handle by edges only, don’t touch surface