Abstract: A head slider has a chamfered pad between the side edge and rail at the surface opposing the disk. The pad prevents contact between the edge of the basic material of the head slider and the disk. Contact between the pad and disk can be generated, but since the pad is chamfered, the disk is not as easily damaged. In comparison with chamfering the basic material and rail, the present invention has less influence on the floating characteristics of the slider, so the amount of chamfering can be increased. Therefore, damage to the disk can be alleviated remarkably and shock resistance of disk apparatus can be much improved.

Abstract: A method is provided to adjust a bias current flowing through a magneto-resistive effect type magnetic head. An examining current is supplied to the magneto-resistive effect type magnetic head, and a voltage applied to a pair of terminals of the magneto-resistive effect type magnetic head is measured. In addition, a resistance of the magneto-resistive effect type magnetic head is calculated according to the examining current and the voltage, and an allowable range of the bias current flowing through the magneto-resistive effect type magnetic head is determined according to a relationship between a life time of the magneto-resistive effect type magnetic head examined in advance and the resistance of the magneto-resistive effect type magnetic head. An optimum bias current is determined within the allowable range in condition that a slice level margin is maximized.