Importance

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Abstract

Degradation in processing capability due to copying during garbage collection is reduced. A data storage system includes a memory unit provided with a memory, into which data are written in units of pages, and a memory controller that controls writing of data to the memory; and a controller that indicates, to the memory controller, a logical page address to which data are to be written. The memory controller determines a target block that is a block to be erased when garbage collection is next performed and provides the controller with information on a logical page address corresponding to a physical page address of a valid page in the target block. The controller instructs the memory controller to write data to the logical page address received from the memory controller.

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First Claim