Patent ID: 7184240

Claim:
A hard disk device adapted to be mounted onto a playing apparatus to play data in the hard disk device, the playing apparatus having an apparatus-side power source circuit, an apparatus-side communicator, a pair of VCM magnets, and a spindle motor, the hard disk device comprising: a casing; a spindle accommodated within the casing and configured to be driven by the spindle motor without being contacted by the spindle motor; a recording medium disk rotatably supported on the spindle and having data recorded therein as pits formed thereon by nano-imprinting; an arm mechanism pivotably supported within the casing; a power supply circuit accommodated within the casing and configured to receive supply of power from the apparatus-side power source circuit of the playing apparatus without contacting the apparatus-side power source circuit; a VCM coil accommodated within the casing, adapted to be positioned between the VCM magnets, and configured to drive the pivoting of the arm mechanism based on a drive current supplied from the power supply circuit; a head slider that is attached to a distal end of an arm of the arm mechanism and has strip line circuits, the strip line circuits including an oscillator configured to output a carrier wave, a resonator circuit into which the carrier wave is configured to be inputted, the resonator circuit including an electrode that is configured to detect an electrostatic capacitance between itself and the recording medium, the resonator circuit being further configured to output an AM modulated wave by the AM modulation of the carrier wave based on the detected electrostatic capacitance, and a detector circuit that is configured to output the electrostatic capacitance by detecting the AM modulated wave; and a communicator configured to receive signals indicating the electronic capacitance detected by the head slider and send the signals to the apparatus-side communicator, and receive drive signals from the apparatus-side communicator and send the drive signals to the VCM coil.