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Write Back: The information is written only to the block in the cache. The modified block is written to the lower level of the hierarchy only when it is replaced. Virtual Memory systems always use write back.
Advantages:
- Individual words can be written by the processor at the rate that the cache, rather than the memory can accept them.
- Multiple writes to a block require only one write to next lower level.
- When blocks are written back, the system can make effective use of a high bandwidth transfer, since the entire block is written.
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