PHOTOELECTRIC RECORDING METHOD

摘要

PURPOSE:To shorten the access time by starting the erasion of the recorded information before the recording start point after one circle to end it before the recording start point. CONSTITUTION:An erasing or recording magnetic field 3 or 4 is applied to a track 2 which is divided into sections by plural sectors 1 formed radially from the center of a disk. The recording start point (the 2st sector) 5 comes back for each rotation. Here the application of the field 3 is started at a time point preceding a recording start point 5 by a sector and finished at a time point preceding the point 5 by a sector. Thus, the magnetic field is inverted immediately. This inversion of the magnetic field is facilitated since the disk revolving speed is high although some time is needed for said inversion of the magnetic field.