Hitachi Global Storage Technologies Netherlands B.v.

Hgst Netherlands, B.v.

Kensuke Ishiwata

Kyo Akagi

Hiroshi Fukuyama

Satoshi Hashimoto

Kazuhiko Washizu

Kanji Nakao

Kazuya Takeda

A method for producing a magnetic disk device includes injecting replacement gas into a hermetically-sealed enclosure by means of an injection nozzle while suctioning gas from inside of the hermetically-sealed enclosure by means of a suction nozzle in such a way that the gas pressure inside of the enclosure does not fall below the vapor pressure of the organic compounds present inside of the enclosure, wherein the hermetically-sealed enclosure houses within a magnetic disk for storing data, a magnetic head for writing/reading the data, and an actuator for moving the magnetic head relative to the magnetic disk, and wherein a gas injection port and a gas expulsion port are formed in the hermetically-sealed enclosure and provide communication between the inside and outside, wherein an injection nozzle is disposed at the gas injection port and a suction nozzle is disposed at the gas expulsion port.

Producing a magnetic disk device

Embodiments of the invention provide a disk device capable of writing highly accurate servo data using an extremely simple technique, and a manufacturing method therefor. According to one embodiment, a method for manufacturing a disk device includes: mounting a magnetic disk and each assembly for driving the magnetic disk, such as an SPM and a VCM, in a base and attaching a top cover so as to seal the enclosure (made up of the base and the top cover) with each assembly of the HDD therein; replacing the air within the hard disk assembly (HDA) with a gas having a lower density than air, such as He; writing servo data to the magnetic disk in a self servo track write operation; and replacing the gas within the HDA with air.

Method of self servo write with low density gas

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Kanagawa, Japan

Kensuke Ishiwata