Invention Grant
US07924527B2 Magnetic disk drive, magnetic disk drive manufacturing method and method of estimating gas amount in magnetic disk drive
有权
磁盘驱动器，磁盘驱动器的制造方法和磁盘驱动器中的气体量的估计方法
- Patent Title: Magnetic disk drive, magnetic disk drive manufacturing method and method of estimating gas amount in magnetic disk drive
- Patent Title (中): 磁盘驱动器，磁盘驱动器的制造方法和磁盘驱动器中的气体量的估计方法
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Application No.: US11899847Application Date: 2007-09-07
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Publication No.: US07924527B2Publication Date: 2011-04-12
- Inventor: Akihiko Aoyagi , Kazuhide Ichikawa , Takashi Kouno , Hitoshi Shindo
- Applicant: Akihiko Aoyagi , Kazuhide Ichikawa , Takashi Kouno , Hitoshi Shindo
- Applicant Address: NL Amsterdam
- Assignee: Hitachi Global Storage Technologies, Netherlands B.V.
- Current Assignee: Hitachi Global Storage Technologies, Netherlands B.V.
- Current Assignee Address: NL Amsterdam
- Priority: JP2006-243469 20060907
- Main IPC: G11B33/14
- IPC: G11B33/14 ; G11B25/04 ; G01N7/16 ; G01N25/18
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.
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