Abstract: A multi-stage tracking control system includes at least a main actuator and a microactuator. The tracking control system is switched to a single-stage mode so that the main actuator alone provides tracking. A disturbance signal is applied to the microactuator while in the single-stage mode, and a failure condition of the microactuator is determined based on a position error generated in response to the disturbance signal.

Abstract: A multi-stage tracking control system includes at least a main actuator and a microactuator. The tracking control system is switched to a single-stage mode so that the main actuator alone provides tracking. A disturbance signal is applied to the microactuator while in the single-stage mode, and a failure condition of the microactuator is determined based on a position error generated in response to the disturbance signal.

Abstract: A mounting apparatus for mounting a drive bracket on which a protruding portion is provided, includes an enclosure, and a mounting member. The enclosure includes a base wall for supporting the drive bracket thereon, a side wall extending from one side of the base wall, and a holder extending from the side wall. The mounting member is movably attached to the holder. The mounting member includes a locking portion extending therefrom for engaging with the protruding portion of the drive bracket.

Abstract: A mounting apparatus for mounting a drive bracket on which a protruding portion is provided, includes an enclosure, and a mounting member. The enclosure includes a base wall for supporting the drive bracket thereon, a side wall extending from one side of the base wall, and a holder extending from the side wall. The mounting member is movably attached to the holder. The mounting member includes a locking portion extending therefrom for engaging with the protruding portion of the drive bracket.

Abstract: A method and disc drive are disclosed that write servo wedges to a plurality of tracks of a disc. A head having a read element offset from a write element reads a servo wedge on a first track as a propagation guide and writes two or more servo wedges to be used as a subsequent propagation guide on a second track, all during one instance of a sector position of the disc rotating by the head. Additionally, a one of the written servo wedges can be radially continuous from the outer to inner diameter and is used for track-following during normal operation. In this manner, all radially continuous servo wedges for each sector of a given track can be written during one revolution of the disc, thereby reducing the amount of time necessary for servowriting.

Abstract: A method and disc drive are disclosed that write servo wedges to a plurality of tracks of a disc. A head having a read element offset from a write element reads a first servo wedge on a first track as a propagation guide and writes a second and third servo wedge to be used as a subsequent propagation guide on a second track, all during one instance of a sector position of the disc rotating by the head. Additionally, a fourth servo wedge that is radially continuous from the outer to inner diameter is also written for each sector of the track during the revolution and is used for track-following during normal operation. In this manner, all radially continuous servo wedges for each sector of a given track can be written during one revolution of the disc, thereby reducing the amount of time necessary for servowriting.