Which of the following memory types requires constant refreshing to maintain its contents?

Question

BlackTom AI · Accepted Answer

Before evaluating the choices, note the core concept: memory types differ in whether their contents need constant refreshing to be retained.
Option a: SRAM. Static RAM uses flip-flops to store each bit, which preserves data as long as power is supplied and does not require periodic refreshing. This makes SRAM fast and stable without refresh cycles.
Option b: Flash. Flash memory is non-volatile and retains data without continuous refreshing; it requires erasing and writing blocks to update data, but no constant refreshing is needed to maintain stored information.
Option c: ROM. Read-Only Memory is non-volatile and holds data permanently or semi-permanently, not requiring refreshing while powered; it is not suitable for random, frequent updates but retains contents without refresh.
Option d: DRAM. Dynamic RAM stores each bit in a tiny capacitor that leaks charge over time; without refresh, the stored value would decay quickly. Therefore DRAM requires periodic refreshing to maintain its contents, which is the hallmark trait that distinguishes it from SRAM, Flash, and ROM.
In summary, the key misconception to avoid is thinking all memory types need refresh; only DRAM needs it due to its capacitor-based storage, while SRAM is static, Flash and ROM are non-volatile or require block operations, and do not rely on constant refresh cycles.

Which of the following memory types requires constant refreshing to maintain its contents?单项选择题

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