| 摘要 |
A protection data control unit is provided for a cache control unit. In the writing operation to write user data from an upper apparatus into a cache memory, protection data is formed on a data block unit basis of the user data and written into the cache memory. When the interruption of the transfer of the data block is detected during the writing into the cache memory, a forming state of the protection data upon interruption is stored in the cache memory. When the transfer restart of the data block is detected after the interruption, the forming state is returned to the forming state of the protection data upon interruption stored in the cache memory and the formation of the protection data is restarted.
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