Patent ID: 6697991
Filing Date: 2004-02-24
Classification: G11B

Abstract:
A data check device of a magnetic disk device, comprising:controller side data check means 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 synchronization, sending of the ECC onto a parity signal line, and at data reading, reception of data on said 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 and sending of the data to the upper circuit; and drive side data check means for conducting, at data writing, reception of data through said data signal line, reception of an ECC on the parity signal line, an ECC check based on the data and the ECC, correction of the data when the error is detected in the ECC check, and sending of the data to a lower circuit, and at data reading, generation of an ECC for data sent from the lower circuit, sending of the data onto said data signal line and sending of the ECC onto the parity signal line.