FLEXIBLE DISK

摘要

PURPOSE:To eliminate the peak shift of a reproduced waveform due to the DC erasion by deleting the history of magnetization of a medium which is applied when a medium defect is extracted in a disk production mode. CONSTITUTION:The magnetized reverse signal which is continuous one or more times is written after a disk defect is extracted to delete the history of magnetization of a magnetic matter that is produced when the disk defect is extracted. Then the information signals are written once or more times to the DC erased disk by using a magnetic head before a format is written. Thus the peak shift of a reproduced waveform is reduced. This eliminates the effects of said peak shift that is caused by the DC erasion.