Explain the working principle of hard disk, Computer Engineering

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Question :

a) Hard disk is an important component of a computer. What type of memory is it?

b) With the help of a diagram describe its features.

c) Explain its working principle.

d) Explain what is meant by ‘Defragmentation' in relation to the hard disk. Why is it important?

e) There are two categories of hard disk. What are these categories? How do they differ from each other?

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