صفحه 1:
OA ساسا
9
صفحه 2:
Oueniew
© CQ its standard و رما و۲ proyranns
© Oses CO-ROD wedia Crom Dek Ren! Od Orem)
لات ل Boppy disk
اه Piel buses) تما لین (chenne) morete ter Gros! Os)
‘©2000 How Stuff Works
fe 1 سحي سلما خرچ یس تسس الوا
صفحه 3:
]مممسس |
= Dry
Biers ocd pulls icp CO tray
۲ Read head
9 Ghiges fight vo CO urd reads
مار
© وب موه
9 Spice the CO at various
speeds
صفحه 4:
|] م Outra Prow u CO
RePlevted hyht is picked up
by seusvr 2
سس مج جمممه موه
۲۳
Ovtor woves the kee to
read ofl parts oP the
مامد CO.
صفحه 5:
Ke
_ [co Proc
۶ CO spine betwerd COO und GOO RPO
depeudiagy vo posiiva oP the Keo
© Paster eur vecter { ce
© عمجم وروا dye
© Det wap dota powes PP disk of save rote
2 Devon: ماو OF اتمه انوا hee
۴ وان witk soPt dacwp clot
© doce by edges oly, doo't truck اس
5
صفحه 6:
How a CD-ROM Works
Bill Holmes
Chandler-Gilbert Community College
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)
http://www2.h-net.msu.edu/~filmhis/resources/CD-ROM.gif
http://entertainment.howstuffworks.com/cd1.htm
Parts Overview
Tray motor
Read head
Ejects and pulls in CD tray
Shines light on CD and reads
reflection
Spin motor
Spins the CD at various
speeds
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.
Demo:
http://entertainment.how
stuffworks.com/cd2.
htm
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