Design of Optimized Opposed Slider Air Bearings for High-Speed Recording on a Metal Foil Disk

[+] Author and Article Information
James White

6017 Glenmary Road, Knoxville, TN 37919

J. Tribol 128(2), 327-334 (Nov 03, 2005) (8 pages) doi:10.1115/1.2162917 History: Received July 05, 2005; Revised November 03, 2005

A metal foil disk offers some of the best characteristics of both the hard disk and floppy disk for digital data storage. The current work defines an opposed slider air-bearing arrangement that provides advantages when used with a high-speed metal foil disk in either a fixed or removable format. Use is made of the fact that the opposing sliders interact through their influence on the flexible disk that is sandwiched between them. Asymmetry of opposing air bearings is created by etching the air-bearing pad opposite the recording element pad to a depth sufficient that the flying height and air film stiffness of the opposing pad reach desired levels. The result is an air-bearing interface with low flying height and high stiffness over the recording element directly opposed by a high flying height and low stiffness on the other side of the disk. This air-bearing interface was found to provide an enhanced dynamic flexibility to the metal foil disk when it is subjected to mechanical shock. As a result, the opposed slider arrangement with metal foil disk is able to avoid contact and impact when subjected to substantial levels of mechanical shock. Thus, wear and damage to slider and disk surfaces are reduced as well as the possibility of lost recorded data. This should make the metal foil disk a strong candidate as a rotating storage medium for mobile and portable applications where a shock environment is common. Computer simulation of the new air-bearing configuration will be presented and discussed. The current work is related to but distinct from that reported recently by White (2005, ASME J. Tribol., 127, pp. 522–529) for a Mylar disk.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Variations of the new slider arrangement: (a) uniformly etched rear pad, (b) uniformly etched shaped rear pad, (c) reverse-step rear pad, (d) compression-step rear pad, (e) uniformly etched rear pad with TPC, and (f) uniformly etched rear pad with TPC and vacuum cavity

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Figure 2

Slider-disk interface

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Figure 3

Dimensionless flying height contours for the side-0 slider with etched upper rear pad

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Figure 4

Dimensionless flying height contours for the side-1 slider with etched lower rear pad

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Figure 5

Pressure profile for side 0 of etched rear pad slider

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Figure 6

Disk deflection profile for etched rear pad slider

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Figure 7

Dimensionless flying height response of etched rear pad slider

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Figure 8

Pressure response of etched rear pad slider at recording elements

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Figure 9

Short-time disk deflection history at both recording elements

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Figure 10

Longer period disk deflection history at side-0 recording element

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Figure 11

Dimensionless flying height response of reference slider on hard disk

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Figure 12

Comparison of etched rear-pad slider and reference slider dimensionless flying height response. Inner diameter, skew=−8.5deg.

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Figure 13

Pressure response at recording element of side-0 etched rear-pad slider. Inner diameter, skew=−8.5deg.




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