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Question

Storage media such as a CD read and write information using

A
a laser beam of red light
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B
magnetic dots
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C
magnetic strips
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D
All of these
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E
None of these
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Solution

The correct option is D All of these

Storage media such as a CD read and write information using All of these.

A laser beam of red light : The least expensive laser pointers use a deep-red laser diode near the 650 nm wavelength. ... For the same optical power, green laser light will seem brighter than other colors because the human eye is most sensitive at low light levels in the green region of the spectrum (wavelength 520–570 nm).

magnetic dots : A hard disk drive (often shortened as hard disk, hard drive, or HDD) is a non-volatile storage device that stores digitally encoded data on rapidly rotating rigid (i.e. hard) platters with magnetic surfaces.

magnetic strips : Magnetic tape data storage is a system for storing digital information on magnetic tape using digital recording. Modern magnetic tape is most commonly packaged in cartridges and cassettes. The device that performs writing or reading of data is a tape drive.


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