Abstract: A data transfer device comprises a unit for collecting data of a control state by monitoring the control state of a circuit which controls communications protocols within the local device, and a unit for detecting an abnormal state of a data transfer based on the collected state data.

Abstract: A data transfer device comprises a unit for collecting data of a control state by monitoring the control state of a circuit which controls communications protocols within the local device, and a unit for detecting an abnormal state of a data transfer based on the collected state data.

Abstract: An error correcting method reducing the time needed to provide error correction using a buffer memory. The method includes performing row error correction by using a plurality of rows of data to produce row-corrected block data and performing column error correction by using the plurality of columns of data to produce column-corrected block data. In addition, at least one of the performing row error correction and performing column error correction operates using a plurality of rows or columns of data in units of a predetermined number of rows or columns so as to provide error correction for the plurality of rows or columns in parallel.

Abstract: A data error correcting method for a disk accessing apparatus including a drive head, a speed matching buffer and a buffer memory is disclosed. Data is read from a disk by the drive head. When a sync pattern is detected in the read data, target data following the sync pattern is sequentially read to temporally store the target data to the speed matching buffer. The target data is transferred from the speed matching buffer to the buffer memory, and is subjected to an error correcting operation. When the detection of sync pattern is unsuccessful, the buffer memory is supplied with dummy data directly, that is, the dummy data does not pass through the speed matching buffer. The dummy data corresponds to the target data following the sync pattern that fails to be detected.