| 摘要 |
A method and an apparatus for verifying data transfer between a data processor having an ATA interface and an external recording unit, capable of reliably preventing a data transfer error while establishing compatibility with existing systems. When data is transferred between a data processor and an external recording unit connected by ATAI/F, a data check code is calculated, in the first stage, on the side of the data processor by regarding the transfer data as serial data, the data check code is calculated, in the second stage, on the side of the external recording unit by regarding this transfer data as serial data, the data check codes calculated on the sides of the data processor and the external recording unit are compared, in the third stage, after completion of the data transfer, and in the fourth stage, the data transfer is judged as normal when the two data check codes coincide with each other and is not judged as normal when they do not coincide, so as to prevent the occurrence of an error in the data transfer. The data verification apparatus is equipped with means for accomplishing the stages described above.
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