JPS61115291A - Magnetic disc recording device - Google Patents

Magnetic disc recording device

Info

Publication number
JPS61115291A
JPS61115291A JP23705984A JP23705984A JPS61115291A JP S61115291 A JPS61115291 A JP S61115291A JP 23705984 A JP23705984 A JP 23705984A JP 23705984 A JP23705984 A JP 23705984A JP S61115291 A JPS61115291 A JP S61115291A
Authority
JP
Japan
Prior art keywords
pressure
inside
reduced
housing
magnetic disc
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP23705984A
Inventor
Takaharu Ariga
Yoshimasa Miura
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP23705984A priority Critical patent/JPS61115291A/en
Publication of JPS61115291A publication Critical patent/JPS61115291A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To prevent the generation of a thermal off track, by constructing the housing so that the inside pressure can be reduced with the similar effect as in case of using the enclosed gaseous He.
CONSTITUTION: The inside of the airtight housing composed of an airtight cover 7 and a base rack 1 is evacuated by a vacuum pump through a vacuum open/close valve, and the pressure of the inside the housing is reduced to, for example, 20% of the atmospheric pressure. When the pressure is reduced to such an extent, the static viscosity coefficient μ changes only little extent without making a bit difference, and it can be regarded approximately as the same. The viscous friction loss T in the low pressure is about 27% which is roughtly the same to the case where the gaseous helium is enclosed, thus bringing about the similar effect. Namely, it is possible to reduce the viscous friction loss against the inside of atmosphere of the magnetic disc device rotating in high speed and the heat due to the air friction, by reducing the pressure instead of enclosing the gaseous helium.
COPYRIGHT: (C)1986,JPO&Japio
JP23705984A 1984-11-09 1984-11-09 Magnetic disc recording device Pending JPS61115291A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23705984A JPS61115291A (en) 1984-11-09 1984-11-09 Magnetic disc recording device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23705984A JPS61115291A (en) 1984-11-09 1984-11-09 Magnetic disc recording device

Publications (1)

Publication Number Publication Date
JPS61115291A true JPS61115291A (en) 1986-06-02

Family

ID=17009807

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23705984A Pending JPS61115291A (en) 1984-11-09 1984-11-09 Magnetic disc recording device

Country Status (1)

Country Link
JP (1) JPS61115291A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6178059B1 (en) 1998-10-20 2001-01-23 International Business Machines Corporation Method for writing servo information on a magnetic recording disk
US6618221B2 (en) 2001-05-07 2003-09-09 International Business Machines Corporation System and method for utilizing an actuator-activated pumping mechanism for reducing the operating pressure of a disk drive assembly
US7218473B2 (en) * 2002-03-22 2007-05-15 Seagate Technology Llc Two-stage sealing of a data storage assembly housing to retain a low density atmosphere
US9293169B2 (en) 2004-05-04 2016-03-22 Seagate Technology Llc Seal-type label to contain pressurized gas environment
US10468071B1 (en) * 2018-06-01 2019-11-05 Western Digital Technologies, Inc. Magnetic storage device with heat-assisted magnetic storage head and associated method of manufacture

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6178059B1 (en) 1998-10-20 2001-01-23 International Business Machines Corporation Method for writing servo information on a magnetic recording disk
US6618221B2 (en) 2001-05-07 2003-09-09 International Business Machines Corporation System and method for utilizing an actuator-activated pumping mechanism for reducing the operating pressure of a disk drive assembly
US7218473B2 (en) * 2002-03-22 2007-05-15 Seagate Technology Llc Two-stage sealing of a data storage assembly housing to retain a low density atmosphere
US7362541B2 (en) 2002-03-22 2008-04-22 Seagate Technology Llc Two-stage sealing of a data storage assembly housing to retain a low density atmosphere
US9293169B2 (en) 2004-05-04 2016-03-22 Seagate Technology Llc Seal-type label to contain pressurized gas environment
US10468071B1 (en) * 2018-06-01 2019-11-05 Western Digital Technologies, Inc. Magnetic storage device with heat-assisted magnetic storage head and associated method of manufacture

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