The magnetic tape in which a difference (S.sub.0.1−S.sub.1.6) between a spacing S.sub.0.1 and a spacing S.sub.1.6 obtained after n-hexane cleaning on a surface of the magnetic layer is equal to or less than 32 nm. The S.sub.0.1 is a value obtained as a spacing under a pressing force of 0.1 atm from a relational expression between a pressure and a spacing obtained by performing a spacing measurement on the surface of the magnetic layer by an optical interference method under a pressing force of each of a plurality of different pressures after the n-hexane cleaning, and S.sub.1.6 is a spacing measured on the surface of the magnetic layer by the optical interference method under the pressing force of 1.6 atm after the n-hexane cleaning.

According to one embodiment, a disk device includes a housing, plurality of magnetic disks that are rotatable in the housing, magnetic heads which process data with respect to the respectively magnetic disks, a head actuator provided in the housing and supporting the magnetic heads to be movable and a capturing part formed of a material that is as easily or more easily electrostatically chargeable as or than a polycarbonate-based material in a triboelectric series, and disposed in the housing.

The magnetic tape in which a difference (S.sub.0.1−S.sub.1.6) between a spacing S.sub.0.1 and a spacing S.sub.1.6 obtained after n-hexane cleaning on a surface of the magnetic layer is equal to or less than 32 nm. The S.sub.0.1 is a value obtained as a spacing under a pressing force of 0.1 atm from a relational expression between a pressure and a spacing obtained by performing a spacing measurement on the surface of the magnetic layer by an optical interference method under a pressing force of each of a plurality of different pressures after the n-hexane cleaning, and S.sub.1.6 is a spacing measured on the surface of the magnetic layer by the optical interference method under the pressing force of 1.6 atm after the n-hexane cleaning.

An approach to a reduced-head hard disk drive (HDD) involves an actuator elevator subsystem that includes a ball screw cam assembly with a hybrid permanent magnet (PM)-variable reluctance (VR) stepper motor disposed therein, to rotate the cam screw, which vertically translates an actuator arm assembly so that a corresponding pair of read-write heads can access different magnetic-recording disks of a multiple-disk stack. A suitably configured hybrid stepper motor can provide 200 full steps/rev for a 3.8 mm translation. Thus, to meet or surpass a step resolution of 6 m/step or 0.5625/step, the hybrid stepper motor would only need to be operated at 4 micro-step mode in order to achieve a 0.45/step or 0.00475 mm/step, which enables a smoother motion since the available holding torque at the 4.sup.th micro-step provides sufficient torque margin to overcome load torque, frictional torque, and detent torque.

According to one embodiment, a magnetic head includes first and second magnetic poles, a conductive part, an element part, and first to fourth terminals. The conductive part is electrically insulated from the first and second magnetic poles. The first and second terminals are electrically connected to the conductive part. The element part is provided between the first and second magnetic poles and electrically connected to the first and second magnetic poles. The element part is conductive. The third terminal is electrically connected to the first magnetic pole. The fourth terminal is electrically connected to the second magnetic pole. A first magnetic pole temperature in a first state is higher than a second magnetic pole temperature of the second magnetic pole in the first state. A first current is supplied between the first and second terminals in the first state.

According to one embodiment, a magnetic head includes first and second magnetic poles, a conductive part, an element part, and first to fourth terminals. The conductive part is electrically insulated from the first and second magnetic poles. The first and second terminals are electrically connected to the conductive part. The element part is provided between the first and second magnetic poles and electrically connected to the first and second magnetic poles. The element part is conductive. The third terminal is electrically connected to the first magnetic pole. The fourth terminal is electrically connected to the second magnetic pole. A first magnetic pole temperature in a first state is higher than a second magnetic pole temperature of the second magnetic pole in the first state. A first current is supplied between the first and second terminals in the first state.

A noncontact communication medium performs communication with an external device in a noncontact manner. The noncontact communication medium includes a resonance circuit, a regulator that generates operating power, a variable resistor, a switcher, and a control circuit. The processing circuit generates a response signal corresponding to a command signal. The switcher switches between an applied state in which a load of the variable resistor is applied to the resonance circuit and a non-applied state in which the load is not applied to the resonance circuit, according to the response signal. The control circuit controls the resistance value according to the bleed power dissipated from the regulator.

A noncontact communication medium performs communication with an external device in a noncontact manner. The noncontact communication medium includes a resonance circuit, a regulator that generates operating power, a variable resistor, a switcher, and a control circuit. The processing circuit generates a response signal corresponding to a command signal. The switcher switches between an applied state in which a load of the variable resistor is applied to the resonance circuit and a non-applied state in which the load is not applied to the resonance circuit, according to the response signal. The control circuit controls the resistance value according to the bleed power dissipated from the regulator.