A magnetic head mounted on a rotary head drum device comprises a head chip, and a magnetic shield disposed to surround all or a part of the surfaces other than a front surface of the head chip. At least one of the terminal pair has a final contact site which is in contact with the counterpart terminal at a final stage of disengagement of the terminal pair. A communications channel may also be monitored while it is in use. The database comparator further is formed to compare the positional description with a plurality of comparative positional descriptions and to obtain information on a position as a result of the comparison. The method involves the steps of recording, through the microphone, an acoustic signal which is emitted by the alert device in response to a drive signal; deriving a characteristic value of the recorded signal; comparing the characteristic value with a reference value and generating a comparison result; and controlling the drive signal of the alert device in response to the comparison result. The power semiconductor package also includes an integrated output inductor stacked over the conductive carrier and configured to couple the switch node segment to the power output segment.