Nonvolatile Semiconductor Memory Drive and Data Management Method of Nonvolatile Semiconductor Memory Drive

A nonvolatile semiconductor memory drive comprising:

• a nonvolatile semiconductor memory;
• and
• a controller configured to control a process of writing and reading data with respect to the nonvolatile semiconductor memory,
• the controller comprising:
• a data management module configured to create, each time n-1 data items of page size are written, first parity data used to restore one data item among the n-1 data items based on the other n-2 data items and to write the created first parity data to an nth page for a plurality of groups, the page size being one of a data write unit to the nonvolatile semiconductor memory and a data read unit from the nonvolatile semiconductor memory, the plurality of groups being formed by connecting n memory blocks in parallel that are independently operable as a management unit of a storage area in the nonvolatile semiconductor memory;
• and
• a logical address storage module configured to store logical address information containing logical addresses indicating storage positions in a logical address space of the nonvolatile semiconductor memory in a redundant area of a page, the logical addresses being allocated to data items of cluster size defined as a management unit of data in the nonvolatile semiconductor memory stored in the page,
• wherein the data management module comprises a write module that creates second parity data used to restore one logical address information item among n-1 logical address information items stored in redundant areas of n-1 pages based on the other n-2 logical address information items and writes the created second parity data to the redundant area of the nth page when the first parity data is written to the nth page.