Patent ID: 8880836

Claim:
A memory system comprising: a receiving unit which receives write-data and a logical address for accessing the write-data; a specific information holding unit which holds specific information for the write-data in association with the logical address, the specific information being determined based on a type of a file in which the write-data is included; a compression determination unit which determines whether to compress the write-data based on the specific information for the write-data, the specific information for the write-data being acquired by referring to the specific information holding unit by using the logical address for the write-data, the specific information including compression determination information of the write-data; a compression unit which compresses the write-data when the compression determination unit determines to compress the write-data; a memory; and a write control unit which causes the memory to write the write-data; wherein the specific information further includes access frequency information of the write-data in association with the logical address, and the compression determination unit determines not to compress the write-data if the write-frequency information for the write-data is marked as high regardless of the compression determination information of the write-data.