Samsung Electronics Co., Ltd.

Hyundai Motor Company

Kia Motors Corporation

Young-Shin Kim

Chang-Hwan Lee

Hae Jung Lee

Jong Lak Park

A tilting pump apparatus includes a pump operation unit arranged between a mudguard, which is configured to obstruct foreign objects entering from a front side, and a tilting pump, which is configured to be rotated for generating hydraulic pressure to transmit movement of the mudguard generated by depressing the mudguard as rotational force for rotating the tilting pump.

Depression operated tilting pump apparatus and cab tilting system employing the pump apparatus

A method of controlling a flying height of a magnetic head of a hard disk drive includes determining whether a difference between a measured flying height of the magnetic head measured by applying a burn-in FOD (flying on demand) voltage corresponding to a target flying height, according to a reference FOD voltage profile defining a relationship between the flying height of the magnetic head and the FOD voltage by which an end of the magnetic head thermally expands and thus protrudes, to a heater included in the magnetic head, and a burn-in flying height of the reference FOD voltage profile corresponding to the burn-in FOD voltage exceeds a preset reference, calculating a corrected FOD voltage for the target flying height by performing a touch down test of the magnetic head with respect to a disk, when the difference between the measured flying height of the magnetic head and the burn-in flying height exceeds the preset reference, and controlling a flying height of the magnetic head by applying the corrected FOD voltage. An FOD voltage can be applied in a variety of environments to substantially maintain the target FH of the magnetic head.

Hard disk drive apparatus, method of controlling flying height of magnetic head thereof, and recording medium to contain computer program therefor

A method of controlling a flying height of a magnetic head of a hard disk drive includes calculating a corrected flying on demand (FOD) voltage to correct a difference between a measured flying height measured by applying a burn-in FOD voltage corresponding to a target flying height and a burn-in flying height in a reference FOD voltage profile corresponding to the burn-in FOD voltage, using the reference FOD voltage profile, in the reference FOD voltage profile that is a profile of a second signal for calculating the flying height of the magnetic head with respect to a first signal for calculating an FOD voltage that allows an end of the magnetic head to thermally expand and protrude when applied to a heater included in the magnetic head, and applying an applied FOD voltage obtained by applying the corrected FOD voltage, to the burn-in FOD voltage, to control the flying height of the magnetic head. Thus, the reliability in the read/write operation can be improved and performance of the hard disk drive can be improved.

Growing community of inventors

Seoul, South Korea

Young-Shin Kim