Stored data processing apparatus, storage apparatus, medium storing stored data processing program, and stored data processing method

A storage apparatus that performs at least write processing for a storage medium on which data is allocated in units of a first block having a predetermined data length, comprising:

• an error correction code addition section that adds an error correction code to data written onto the storage medium for each first block;
• a calculation section that performs calculation for each bit position using data of all the first blocks in a second block and outputs a result of the calculation as calculation data, the second block being constituted by a plurality of the first blocks each including the error correction code added by the error correction code addition section and specified as an update target;
• and
• a write section that writes the calculation data output from the calculation section in a third block associated with the second block as the update target.

A computer readable storage medium storing a stored data processing program allowing a stored data processing program for use in a storage apparatus that performs at least write processing for a storage medium on which data is allocated in units of a first block having a predetermined data length to be read by a computer, that allows the computer to execute a process comprising:

• adding an error correction code to data written onto the storage medium for each first block;
• performing calculation for each bit position using data of all the first blocks in a second block, the second block being constituted by a plurality of the first blocks each including the error correction code added in the adding and specified as an update target;
• outputting a result of the calculation by the performing of calculation as calculation data;
• and
• writing the calculation data output from the outputting in a third block associated with the second block as the update target.

A stored data processing method for use in a storage apparatus that performs at least write processing for a storage medium on which data is allocated in units of a first block having a predetermined data length, the method comprising:

• adding an error correction code to data written onto the storage medium for each first block;
• performing calculation for each bit position using data of all the first blocks in a second block, the second block being constituted by a plurality of the first blocks each including the error correction code added in the adding and specified as an update target;
• outputting a result of the calculation by the performing of calculation as calculation data;
• and
• writing the calculation data output from the outputting in a third block associated with the second block as the update target.