BLOCK DATA PARTIAL UPDATE DEVICE, BLOCK DATA PARTIAL UPDATE METHOD AND BLOCK DATA PARTIAL UPDATE PROGRAM

摘要

PPROBLEM TO BE SOLVED: To provide a block data partial update device, a block data partial update method, and a block data partial update program, capable of preventing adding a correct BCC (block check code) to false updated data. PSOLUTION: In the block data partial update device 1, a Read DMA 13 stores CRC of original data read from a cache memory 11 to an original data CRC storage part 15, and stores CRC of update data to an update data CRC storage part 17. An update original partial CRC operation part 16 calculates, based on block data of a part to be updated of the original data read by the Read DMA 13, CRC (update original partial CRC) of block data of the part to be updated. A BCC operation part 18 calculates, based on the original data CRC, the update original partial CRC, and the update data CRC, CRC of updated data. PCOPYRIGHT: (C)2008,JPO&INPIT