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Which of the following is not a part of Hard disk?

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Which of the following is not a part of Hard disk?

(a) Platter

(b) Read/Write

(c) Valve

(d) Spindle

I have been asked this question in unit test.

This intriguing question comes from Read Only Memory (ROM) topic in portion Memory Devices of Digital Circuits

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The correct option is (c) Valve

For explanation: A valve is a device that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways. So, it is not a part of hard disk.

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