Non-volatile memory device

A non-volatile memory device comprising:

• a non-volatile memory;
• a volatile memory;
• and
• a controller coupled to the non-volatile memory, the volatile memory, and a higher-level apparatus, wherein
• the non-volatile memory includes a plurality of physical storage area groups,
• each physical storage area group is at least one area that is a unit of erase,
• each physical storage area group includes a plurality of physical storage areas,
• each physical storage area is an area that is a unit of write and read, and
• the controller is configured to:
• store, in the volatile memory, classification information representing a classification of each of the plurality of physical storage area groups;
• with respect to a specified logical storage area to be provided to the higher-level apparatus, associate a specified physical storage area group and a specified physical storage area in the specified physical storage area group, write specified data to the specified physical storage area, write specified write frequency information representing a write frequency of the specified logical storage area to the non-volatile memory, and store, in the volatile memory, translation information representing the specified logical storage area, the specified physical storage area group, and the specified physical storage area;
• and
• when it is determined that a copy of the specified data from the specified physical storage area to another physical storage area is to be executed, read the specified data stored in the specified physical storage area and the specified write frequency information stored in the non-volatile memory, select a write destination physical storage area group from the plurality of physical storage area groups based on the specified write frequency information and the classification information, select a write destination physical storage area from the write destination physical storage area group, change the specified write frequency information, write the specified data to the write destination physical storage area, write the changed specified write frequency information to the non-volatile memory, and update the translation information based on the write destination physical storage area group and the write destination physical storage area.