COMPUTER HARDWARE
STORAGE DEVICES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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O binary
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1 binary
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1 in hexadecimal
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0 in hexadecimal
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1A binary
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Detailed explanation-1: -An optical disc is a flat, usually circular disc which encode binary data in the form of pits and lands on a special material on one of its flat surfaces. The lands represent “1” and the pits represent “0” in binary computing.
Detailed explanation-2: -To the bottom right of the mirror is the main photodiode that senses the beam reflected off the disc. Above the main photodiode is a second photodiode that is used to sense and regulate the power of the laser.
Detailed explanation-3: -3.3 Metal (Reflective) Layer. The metal layer in optical discs reflects the laser beam back to the laser photosensor in the laser head. Three types of reflective metals are typically used for this layer: aluminum, gold, and silver or silver alloy.
Detailed explanation-4: -The first thing one would notice is the bumps on the aluminum surface. These bumps are where the digital data is stored in binary form. The areas where the Aluminum is closer to the bottom (plastic), are called Lands, and the opposite bumps are called Pits.