DISK MEMORY DEVICE, DISK MEMORY DEVICE DEFECT DETECTING METHOD, AND PROGRAM RECORDING MEDIUM

摘要

A disk memory device in which an access time measuring unit for measuring the time required to read or write a predetermined amount of data, an access time defect judging unit for comparing the access time data with a predetermined limit time, judging that the relevant area in a disk memory (4) is defective if the access time data is over the limit time, and entering the area in a defect list so as to specify the area as an used one. Thus, when such a disk memory device is used for recording/reproducing AV data, data access is made within a predetermined time, video is reproduced without break, and data can be recorded without frame missing.