Memory system and memory controller

Abstract

This invention provides a memory system capable of appropriately controlling the writing method. According to an embodiment, the memory system includes non-volatile memory and a memory controller for controlling the non-volatile memory. The memory controller is configured to: as a method of writing data to the non-volatile memory, correspond to a first writing method of writing 1 bit of data to each memory cell and a second writing method of writing N bits of data to each memory cell; when the capacity of the written data is below a threshold related to the execution of garbage collection, the first writing method writes the data to the non-volatile memory; when the capacity of the written data exceeds the threshold, the second writing method writes at least (the amount exceeding the threshold) + ((the amount exceeding the threshold) / (N-1)) of the written data to the non-volatile memory, and the first writing method writes the remaining data to the non-volatile memory.

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