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Why primary memories are faster than secondary memories?

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asked Feb 17 in Hardware by Unicodist
As you know, there are two types of memories in a computer, primary memories like RAM, ROM, and cache. The secondary memory includes hard drives, pen drives, optical disks etc. But primary memory is faster than secondary memory. What is the reason?

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answered Mar 1 by mebigyan01
It is because it is directly connected to the processor. Thus for storing temporary files and caches primary memory is used which is fast to access than the secondary memory.
commented Mar 10 by Unicodist
That doesn't satisfy me, Primary memory is used for the processing process because they are faster.  But my question is what makes them faster?

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