Storage device, storage system, and method

A storage system, comprising:

• a storage device comprising a non-volatile memory;
• and
• a control unit that is electrically connected to the storage device and that is configured to control the non-volatile memory,
• wherein the control unit is configured to:
• manage a plurality of management areas obtained by logically partitioning storage area of the non-volatile memory provided to the storage device,
• when a write request is received that includes data for which a valid term has been set, determine, based on the valid term, a first management area from among the management areas,
• write the data included in the write request to the determined first management area, and
• when the data written to the first management area is erased, collectively erase all data written in the first management area which includes the data.

A method, comprising:

• managing a plurality of management areas obtained by logically partitioning storage area of a non-volatile memory;
• when a write request is received that includes data for which a valid term has been set, determining, based on the valid term, a first management area from among the management areas;
• writing the data included in the write request to the determined first management area;
• and
• when the data written to the first management area is erased, collectively erasing all data written in the first management area which includes the data.