Memory system, control device and control method

Abstract

This invention provides a memory system, control device, and control method that can reduce the processing cost of data configuration optimization. One embodiment of the memory system includes one or more memory units and a controller. The controller is capable of communicating with a host computer and is configured to control the memory. The memory system has a cache for temporarily storing data read from the memory. When the controller receives a prefetch request from the host computer, it reads the prefetch target data from the memory and stores it in the cache. For each piece of data read from the memory according to the on-demand access request from the host computer, it manages first information related to whether the prefetch is valid, and based on the first information, performs a first process related to data configuration optimization of the data stored in the memory.

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