ITPEC IP April 2019 Question 11

Which of the following is an appropriate description concerning flash memory?

a)It becomes read-only storage once data is written.b)No power supply is required to retain stored data.c)It is not used for digital cameras because of the difficulty of downsizing.d)Data is read or written using laser light.

Explanation

No power supply is required to retain stored data — flash memory is non-volatile semiconductor memory.

Flash memory stores data as electric charge trapped in its memory cells, and the charge stays when the power is removed, so the data remains. It can be erased electrically (in blocks) and rewritten many times, and it is small, light and has no moving parts, which is why it is used in SD cards, USB memory, SSDs, smartphones and digital cameras.

Answer (b)

Why not others:

•(a) — describes write-once media such as a CD-R; flash memory is rewritable
•(c) — flash memory is compact and is exactly the medium digital cameras use (SD cards)
•(d) — describes optical discs (CD, DVD, Blu-ray); flash memory is read and written electrically

Key rule: Flash memory is non-volatile, electrically rewritable semiconductor memory; DRAM and SRAM are volatile and lose their data when the power is off.

Computer Component · AI-written, may contain errors

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