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Research Papers: Magnetic Storage

Air Bearing Interface Characteristics of Opposed Asymmetric Recording Head Sliders Flying on a 1 in. Titanium Foil Disk

[+] Author and Article Information
James White

6017 Glenmary Road, Knoxville, TN 37919

J. Tribol 130(4), 041902 (Aug 25, 2008) (10 pages) doi:10.1115/1.2966386 History: Received August 27, 2007; Revised April 25, 2008; Published August 25, 2008

The current effort was motivated by the increasing appearance of data storage devices in small portable and mobile product formats and the need for these devices to deliver high storage capacity, low power requirements, and increased ruggedness. In order to address these requirements, this work considered the storage device to utilize a 1 in. titanium foil disk and a pair of opposed femtosized zero-load recording head sliders with asymmetrically configured air bearing surfaces. A titanium foil disk, due to its reduced thickness and relatively low mass density, requires less operational energy than a hard disk while providing storage densities and data transfer rates typical of a hard disk. The zero-load sliders were chosen in order to make negligible the air bearing interface normal force acting on the disk surface that can lead to high speed disk instability. The asymmetry of the slider air bearing surfaces, together with the disk dynamic flexibility, greatly improves the ability of the slider-disk interface to absorb substantial mechanical shock and other dynamic effects without the associated contact and impact typically observed with a hard disk. The current project evaluated the characteristics of this slider-disk air bearing interface for both static and unsteady operating conditions. Time dependent studies included a numerical simulation of the dynamic load process and the response to mechanical shock. A comparison with the performance of a hard disk interface was also included.

Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Slider-disk interface for dual-etch ABS

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Figure 3

Pressure profile for the side 0 slider

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Figure 4

Disk deflection for static operation

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Figure 5

Fly height sensitivity to etch depth

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Figure 6

Equilibrium slider load sensitivity to fly height

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Figure 9

Dimensionless fly height response following a vertical impulse toward the disk

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Figure 10

Disk deflection profile following a vertical impulse toward the disk: (a) first minimization of the side-1 minimum fly height and (b) second minimization of the side-1 minimum fly height

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Figure 11

Dimensionless fly height response following a vertical impulse away from the disk

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Figure 12

Dimensionless fly height response following a roll impulse

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Figure 13

Disk deflection histories following simultaneous vertical impulses toward the disk

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Figure 14

Minimum fly height history due to the passage of spherical bump asperity

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Figure 15

Slider-disk interface for triple-etch ABS

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Figure 16

Pressure profile for the side 0 triple-etch slider

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Figure 17

Dimensionless fly height contours for the side 0 triple-etch slider

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Figure 8

Fly height history for various preload conditions

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Figure 7

Fly height history for various initial velocities of approach

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Figure 2

Dimensionless fly height contours for the side 0 slider

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