| 摘要 |
A data transfer device has a data receiver, a data control unit, and a data storage unit. In a control method for the data transfer device, the data control unit reads serial data from the storage device in block units and stores this serial data in the data storage unit. When a block constituting the write destination of the write data and a block stored in the data storage unit differ, the data control unit generates a security code, based on the serial data stored in the data storage unit, and adds the generated security code to the serial data before transferring this serial data to the storage device. The data control unit reads the serial data in the block constituting the write destination of the write data, before storing this serial data in the data storage unit, and updates the stored serial data by means of the write data.
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