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Computer Fundamentals - Engineering

Q1:

Which of the following is not used as secondary storage

A Semiconductor memory

B Magnetic disks

C Magnetic drums

D Magnetic tapes

E None of the above

ANS:A - Semiconductor memory

I am confused for this answer. How can semiconductor memory not used as secondary storage?

What is pen-drive then? Is not the pen-drive Semiconductor memory? Please, help me here.