Magnetic disk drive, magnetic disk drive manufacturing method and method of estimating gas amount in magnetic disk drive
AssigneeHitachi Global Storage Technologies Netherlands B.V.
InventorsAkihiko Aoyagi, Kazuhide Ichikawa, Takashi Kouno, Hitoshi Shindo
Life of this patent
Estimating the term…
Abstract
Embodiments of the present invention provide a magnetic disk drive that can estimate the amount of gas filled in a housing precisely and simply. According to one embodiment, a magnetic disk drive including a housing in which a magnetic disk and a magnetic head are accommodated and gas having lower density than air is filled, a heating body provided in the housing, and means for holding a reference value of a parameter representing the temperature change speed of the heating body when the heating body is heated in the housing filled with a predetermined reference amount of the gas.
Claims20
A magnetic disk drive, characterized by comprising:
- a housing in which a magnetic disk and a magnetic head are accommodated and gas having lower density than air is filled;
- a heating body provided in the housing;
- and
- holding means for holding a reference value of a parameter representing a temperature change speed of the heating body when the heating body is heated in the housing filled with a predetermined reference amount of the gas.
Dependencies are inferred from the claim text.