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Which is the cheapest memory device in terms of costs/ bit?

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Which is the cheapest memory device in terms of costs/ bit?

(a) Semiconductor memory

(b) Magnetic disks

(c) Compact disks

(d) Magnetic tapes

I got this question during an online exam.

Question is from Physical Storage Media topic in section Storage and File Structures of Database Management

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Best answer
The correct answer is (c) Compact disks

The best explanation: Compact disk is used for easy storage at lower cost.

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