Analysis of dynamic response of hard disk drive according to air bearing stiffness

A finite element model of a hard disk drive (HDD) is developed to investigate the transient response of an operational HDD subject to shock and vibration. The air bearing stiffness of the head disk interface is determined from a finite element solution of the Reynolds equation and approximated with linear springs. The structural response is analyzed for several types of sliders with a wide range of air bearing stiffness. Results show the response of the head-disk interface subject to shock and the modes excited by vertical and lateral vibrations of the HDD.

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Optimization of Air Bearing Contours for Shock Performance of a Hard Disk Drive

Magnetic Storage Symposium: Frontiers of Magnetic Hard Disk Drive Tribology and Technology ◽

10.1115/2003-trib-342 ◽

2003 ◽

Cited By ~ 1

Author(s):

Eric M. Jayson ◽

Frank E. Talke

Keyword(s):

Hard Disk Drive ◽

Hard Disk Drives ◽

Hard Disk ◽

Disk Drive ◽

Element Model ◽

Time Dependent ◽

Air Bearing ◽

Disk Interface ◽

Shock Response ◽

Shock Event

Hard disk drives must be designed to withstand shock during operation. Large movements of the slider during shock impulse can cause reading and writing errors, track misregistration, or in extreme cases, damage to the magnetic material and loss of data. The design of the air bearing contour determines the steady state flying conditions of the slider as well as dynamic flying conditions, including shock response. In this paper a finite element model of the hard disk drive mechanical components was developed to determine the time dependent forces and moments applied to the slider during a shock event. The time dependent forces and moments are applied as external loads in a solution of the dynamic Reynolds equation to determine the slider response to a shock event. The genetic algorithm was then used to optimize the air bearing contour for optimum shock response while keeping the steady flying conditions constant. The results show substantial differences in the spacing modulation of the head/disk interface after a shock as a function of the design of the air bearing contour.

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3222 Characteristics Analysis and Optimum Design of Small size Thrust Air Bearing for Hard Disk Drive : Application to Optimum Design

The proceedings of the JSME annual meeting ◽

10.1299/jsmemecjo.2008.4.0_141 ◽

2008 ◽

Vol 2008.4 (0) ◽

pp. 141-142

Author(s):

Tadashi NAMBA ◽

M. Danial IBRAHIM ◽

Masayuki OCHIAI ◽

Hiromu HASHlMOTO

Keyword(s):

Hard Disk Drive ◽

Optimum Design ◽

Hard Disk ◽

Disk Drive ◽

Air Bearing ◽

Characteristics Analysis

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3221 Characteristics Analysis and Optimum Design of Small Size Thrust Air Bearing for Hard Disk Drive : Parametric Study

The proceedings of the JSME annual meeting ◽

10.1299/jsmemecjo.2008.4.0_139 ◽

2008 ◽

Vol 2008.4 (0) ◽

pp. 139-140

Author(s):

M. Danial Ibrahim ◽

Tadashi Nanba ◽

Masayuki Ochiai ◽

Hiromu Hashimoto

Keyword(s):

Hard Disk Drive ◽

Optimum Design ◽

Parametric Study ◽

Hard Disk ◽

Disk Drive ◽

Air Bearing ◽

Characteristics Analysis

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Strain imaging of a magnetic layer formed on an air bearing surface of a hard disk drive head for perpendicular recording

Journal of Vacuum Science & Technology B Microelectronics and Nanometer Structures Processing Measurement and Phenomena ◽

10.1116/1.3043457 ◽

2009 ◽

Vol 27 (2) ◽

pp. 997 ◽

Cited By ~ 3

Author(s):

Keiji Takata

Keyword(s):

Hard Disk Drive ◽

Magnetic Layer ◽

Hard Disk ◽

Disk Drive ◽

Strain Imaging ◽

Air Bearing ◽

Bearing Surface ◽

Perpendicular Recording

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In-Situ Mechanical Impedance of Air Bearing in Hard Disk Drive

Asia-Pacific Magnetic Recording Conference 2006 ◽

10.1109/apmrc.2006.365947 ◽

2006 ◽

Author(s):

Hanxiang He ◽

Shih-Fu Ling

Keyword(s):

Hard Disk Drive ◽

Mechanical Impedance ◽

Hard Disk ◽

Disk Drive ◽

Air Bearing

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Optimization of Air Bearing Contours for Shock Performance of a Hard Disk Drive

Journal of Tribology ◽

10.1115/1.2000979 ◽

2005 ◽

Vol 127 (4) ◽

pp. 878-883 ◽

Cited By ~ 10

Author(s):

Eric M. Jayson ◽

Frank E. Talke

Keyword(s):

Hard Disk Drive ◽

Hard Disk Drives ◽

Hard Disk ◽

Disk Drive ◽

Element Model ◽

Time Dependent ◽

Air Bearing ◽

Disk Interface ◽

Shock Response ◽

Shock Event

Hard disk drives must be designed to withstand shock during operation. Large movements of the slider during a shock impulse can cause reading and writing errors, track misregistration, or in extreme cases, damage to the magnetic material and loss of data. The design of the air bearing contour determines the steady-state flying conditions of the slider as well as dynamic flying conditions, including shock response. In this paper a finite element model of the hard disk drive mechanical components was developed to determine the time dependent forces and moments applied to the slider during a shock event. The time-dependent forces and moments are applied as external loads in a solution of the dynamic Reynolds equation to determine the slider response to a shock event. The genetic algorithm was then used to optimize the air bearing contour for optimum shock response while keeping the steady flying conditions constant. The results show substantial differences in the spacing modulation of the head-disk interface after a shock as a function of the design of the air bearing contour.

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