1989 年 13 巻 S_1_PMRC_89 号 p. S1_263-266
We have developed a thin film single-pole head/double-layer perpendicular media combination for rigid disk drive. It has many perfect performances and some unsatisfactory performances, there is a minor pulse in the read-back signal. The minor pulse is produced by the tail of ferrite slide which acts as a side pole. As recording density increases, adjacent pulses will close each other, and the minor pulse will be added to the adjacent main pulse, the asymmetry and the peak shift of the minor pulse will be aggravated. We use an equalizer to improve the read-back pulse with a minor pulse. The minor pulse is reduced. The read channel of longitudinal recording rigid disk drive is still suitable for rigid disk drive with single pole head/double layer perpendicular media if the equalizer circuit is modified.