Memory system and control method

A control method for a memory system which includes a nonvolatile memory having a first memory area including multiple chips and a second memory area, the control method comprising:

• writing a first data among write data to be written across the multiple chips of the first memory area into part of the first memory area and writing, in response to a power supply disconnection being detected before writing second data among the write data into the first memory area, a first information about a storage location where the second data has been stored and the second data into the second memory area;
• reading, in response to power return being detected, the first data from the part of the first memory area, and reading the first information from the second memory area;
• generating a second information about a reference location to access the second data based on the read first information;
• reading the second data from the second memory area to store the read second data based on the generated second information;
• and
• writing the read first data and the stored second data into another part of the first memory area.