Abstract: A first resistance value of an electromagnetic transducer is calculated based on an examination current of a first current value. A second resistance value of the electromagnetic transducer is calculated based on the examination current of a second current value different from the first current value. A quantity of variation in temperature is derived based on the first and second resistance values. An expected lifetime of the electromagnetic transducer is calculated based on the derived quantity of variation in temperature. A current value for a sensing current to be supplied to the electromagnetic transducer is determined based on the calculated expected lifetime. It is possible to reliably set the maximum current value for the sensing current without suffering from deterioration or a shortened lifetime of the electromagnetic transducer resulting from a fracturing or destructive phenomenon such as a migration.

Abstract: A suspension is cantilevered at the tip end of a carriage arm. A magnetic head is mounted on the free end of the suspension. A lift bar in parallel with the disk surface contacts the suspension from the below. The lift bar may move in the path intersecting the suspension while contacting the suspension. The lift bar thus generates the warp in the suspension. The magnetic head at the free end of the suspension may be kept away from the disk surface as a result of the warp in the suspension. The adjustment of the orientation of the lift bar prevents the suspension from twisting.

Abstract: A suspension is cantilevered at the tip end of a carriage arm. A magnetic head is mounted on the free end of the suspension. A lift bar in parallel with the disk surface contacts the suspension from the below. The lift bar may move in the path intersecting the suspension while contacting the suspension. The lift bar thereby generates the warp in the suspension. The magnetic head at the free end of the suspension may be kept away from the disk surface as a result of the warp in the suspension. The adjustment of the orientation of the lift bar enables to prevent the suspension from twisting.

Abstract: A first resistance value of an electromagnetic transducer is calculated based on an examination current of a first current value. A second resistance value of the electromagnetic transducer is calculated based on the examination current of a second current value different from the first current value. A quantity of variation in temperature is derived based on the first and second resistance values. An expected lifetime of the electromagnetic transducer is calculated based on the derived quantity of variation in temperature. A current value for a sensing current to be supplied to the electromagnetic transducer is determined based on the calculated expected lifetime. It is possible to reliably set the maximum current value for the sensing current without suffering from deterioration or a shortened lifetime of the electromagnetic transducer resulting from a fracturing or destructive phenomenon such as a migration.

Abstract: An optimum write current, which is supplied to a recording head when the recording head is used for recording information onto a recording medium, is set. An ambient temperature is set. A plurality of write currents are set in the set ambient temperature. A signal is written onto the recording medium with the set plurality of write currents and a demodulation margin is detected for each write current of the plurality of write currents. An optimum write current is determined from the plurality of write currents for the ambient temperature based on the demodulation margins detected for the respective write currents. The above-mentioned operations are performed for each of a plurality of ambient temperatures, and an optimum write current is obtained for each ambient temperature of the plurality of ambient temperatures.