Air Bearing Slider-Disk Interface for Single-Sided High Speed Recording on a Metal Foil Disk

[+] Author and Article Information
James White

  6017 Glenmary Road Knoxville, TN 37919

J. Tribol 129(3), 562-569 (Mar 19, 2007) (8 pages) doi:10.1115/1.2736442 History: Received April 24, 2006; Revised March 19, 2007

There are disk-drive data storage applications best served by single-sided recording configurations. These include situations where (i) storage requirements can be achieved on a single side of a disk and (ii) dimensional constraints on the disk drive prohibit the presence of a recording head and its associated mounting device on each side of the disk. Even if dimensional requirements are not a concern, the most cost-effective and operationally efficient slider-disk air-bearing interface for single-sided recording is one that does not include an air-bearing slider, pressure pad, or other air-bearing structure on the nondata side of the disk. A metal foil disk offers some of the best characteristics of both the hard disk and floppy disk for digital data storage. It offers hard disk recording densities, increased shock resistance, reduced manufacturing cost, and requires less operational energy than a hard disk. However, use of a conventional recording head slider assembly without opposing air-bearing support for single-sided recording on a high-speed metal foil disk presents a fundamental problem because the air-bearing surface of the slider produces a net transverse force to the disk. This force causes the disk to deflect and can result in flying height and stability problems at the slider-disk interface. The current work describes an air-bearing interface for low flying height single-sided recording on a high-speed metal foil disk that minimizes disk deflection and instability without the presence of air-bearing components on opposing sides of the disk. The new interface utilizes a vacuum cavity-type air-bearing with little or no preload. Examples will be presented and discussed for the new interface that illustrate the flying characteristics of a picosized slider on a 1.8in. stainless steel disk with thickness of 25.4μm.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

Slider-disk interface

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Figure 2

Dimensionless static fly height contours for the vacuum cavity slider

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Figure 3

Static pressure profile for the vacuum cavity slider

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Figure 4

Static disk deflection profile for the vacuum cavity slider

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Figure 5

Equilibrium slider load as a function of fly height

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Figure 6

Dimensionless minimum and gap fly height response for static initiation of dynamic load

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Figure 7

Disk deflection history during dynamic load as a function of initial slider velocity

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Figure 8

Disk deflection profile following static initiation of dynamic load (time=0.09ms)

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Figure 9

Dimensionless minimum fly height dynamic load history for four initial conditions

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Figure 10

Slider response to three dynamic load initial conditions: (a) Change in pitch angle and (b) change in center of gravity location

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Figure 11

Disk deflection profile following dynamic load initial velocity of 5cm∕s: (a) First minimum peak (time=0.27ms) and (b) first maximum peak (time=0.64ms)

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Figure 12

Dimensionless fly height response comparison for impulse velocity of 2.5cm∕s

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Figure 13

Short-time dimensionless fly height response comparison for three impulse velocities

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Figure 14

Short-time disk deflection and slider center of gravity response for three impulse velocities



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