Explain memory hierarchy.
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Memory hierarchy:

Main memory is large, inexpensive, slow memory stores entire program and data.

Cache memory is small, expensive, fast memory stores copy of likely accessed parts of large memory.

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There are four major storage levels.

1.Internal-Processor, register, and cache.

2.Main-the system RAM and controller cards.

3.On-line mass storage-secondary storage.

4.Off-line bulk storage-tertiary and off-line storage.


Memory or storage are classified into two categories:

1.volatile memory

2.non-volatile memory


In memory hierarchy the smaller memory is faster and larger memory storage is slower.

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