INPUTOUTPUT AND STORAGE DEVICES
STORAGE DEVICES HARD DISK SSD AND FLASH MEMORY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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CDs have a spiral track. A laser beam reflects off it to read binary data as ‘burnt’ spots (or not ‘burnt’) as the disk spins round.
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False-CDs don’t actually spin
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False-you can’t use lasers, it is dangerous.
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True-and you can fit about 650 million bits on a CD
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False-there is no spiral track, but the rest is correct
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Explanation:
Detailed explanation-1: -An optical disk drive (ODD) uses a laser light to read data from or write data to an optical disc. These include CDs, DVDs, and Blu-ray discs. This allows you to play music or watch movies using pre-recorded discs.
Detailed explanation-2: -Conventional optical technologies such as CD, DVD and magneto-optical (MO) drives write data using red lasers. But makers of storage systems and recording media are developing ways to read and write using more efficient blue lasers.
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