METHOD FOR CORRECTING ERROR BY EXACTLY JUDGING POSITION OF DATA ERROR ON DATA MEMORY DISK, AND METHOD FOR CORRECTING ERROR BY EXACTLY JUDGING POSITION OF DATA ERROR ON DATA MEMORY MEDIUM

摘要

PROBLEM TO BE SOLVED: To exactly pinpoint a data error on a magnetic memory disk and to correct the same by applying a protocol for correcting intra-error data by reading out the data equivalent to one sector and detecting the data error start position and end position thereof. SOLUTION: The data is read out >=2 times and the respective continuous read-outs are compared with the previous read-outs and the approximate data error position is pinpointed. Whether the position for the intra-error data is detected or not is then judged. When the data are judged to have the error position where the intra-error data are detected, the protocol reregulates the data error start position as if this position is a predetermined number of the continuous byte positions at the left of the previously detected data error start position, thereby attempting the correction. A data correction algorithm is applied to the respective continuous and iterative trials for correcting the data regulated between the data error start position and the end position.