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If the data is not in the cache already the storage device sends the data requested to a cache, which results in a wait stage, when the data has been copied to the cache it can then be transferred to the requesting device. Caches have faster transfer rates than that of your typical storage devices, thus when the request is sent to the cache for the data it can be transferred a lot faster than if it is transferred from the storage device, the data is then also not deleted immediately so if the data is required again, there is no wait stage and the data can be transferred immediately.

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Q: How can cache be used to improve performance when reading data from a storage device?
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