COMPUTER ARCHITECTURE
SECONDARY STORAGE DEVICES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Uses magnetic fields to read/write data onto a metal disc.
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Uses electronic pulses to read/write data onto a metal disc
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Uses a magnetic chip to store data
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Uses a laser to read/write data onto a metal disc
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Detailed explanation-1: -Ans : A hard disk is a storage device that uses a rotating magnetic disk to store data.
Detailed explanation-2: -As the disk is spinning, a read/write head moves across its surface. To write data, the head magnetises or demagnetises a section of the disk that is spinning under it. To read data, the head makes a note of whether the section is magnetised or not. Magnetic devices are fairly cheap, high in capacity and durable.
Detailed explanation-3: -They store data in the form of magnetized spots in adjacent circular tracks on the surface of a metal cylinder. A single drum may carry from one to 200 tracks. Data are recorded and read by heads positioned near the surface of the drum as the drum rotates at about 3, 000 revolutions per minute.