| 摘要 |
A data check device of a magnetic disk device including a controller side data check circuit for conducting, at data writing, generation of an ECC for data sent from an upper circuit, sending of data through a data signal line and, in synchronism, sending of the ECC onto a parity signal line, and at data reading, reception of data on the data signal line, reception of an ECC on the parity signal line, an ECC check based on the data and the ECC, correction of an error when the error is detected in the ECC check. Comparable data checking is performed on the drive side which includes a lower circuit.
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