The main disadvantage of direct mapping of cache organisation is that….

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The main disadvantage of direct mapping of cache organisation is that

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1. it does not allow simultaneous access to the intended data and its tag
2. it is more expensive than order type of organisations
3. the cache hit ratio is degraded if two or more blocks, used alternatively, map into the same block frame in the cache
4. the number of blocks required for the cache increases linearly with the size of the main memory

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