| 摘要 |
PROBLEM TO BE SOLVED: To execute consistent error check in the whole system constitution device on the basis of data outputted from a transfer source and information equivalent to a CRC code. SOLUTION: Data and a CRC code are transferred from an external disk IF 110 in a host computer 11 to a host IF 121 in a disk system 12. The host IF 121 performs CRC check based on the data and the CRC code, and when there is no error, the data and the CRC code are respectively transferred to a cache controller 122 respectively through a data transfer bus 14 and a CRC bus 15. Then the data and the CRC code are transferred to respective devices in the order of the cache controller 122→a cache memory 123→the controller 122→an HDD-IF 124→an HDD 125 and CRC check is performed in each device. In addition to the data, the CRC code also is stored in the cache memory 123 and the HDD 125.
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