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Research Papers: Magnetic Storage

The Gas Bearing Interface of Opposed Recording Heads in a Disk Drive Utilizing Helium and Thin Titanium Foil Disks

[+] Author and Article Information
James White

Antek Peripherals Inc.,
6017 Glenmary Road,
Knoxville, TN 37919

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received March 3, 2014; final manuscript received June 19, 2014; published online July 16, 2014. Assoc. Editor: Min Zou.

J. Tribol 136(4), 041901 (Jul 16, 2014) (9 pages) Paper No: TRIB-14-1050; doi: 10.1115/1.4027899 History: Received March 03, 2014; Revised June 19, 2014

Increased storage capacity and decreased power consumption are two key motivations in the development of hard disk drive (HDD) storage products. Two ideas that address these areas have recently received attention in the literature. These are (1) the use of helium instead of air as the working gas in the drive and (2) the incorporation of a thin metal foil as the disk substrate, replacing the much thicker aluminum or glass substrate of the hard disk (HD). The work that has been previously reported considered either the use of helium or thin foil substrates, but not both. This paper does consider both. It reports dynamic gas bearing simulation results for the helium filled interface between opposed recording heads and a disk whose substrate is a thin titanium foil. Motivation for the selection of titanium as the foil material is described in the paper. The thickness of the foil is chosen so as to achieve an optimal combination of centrifugal force and bending force that will provide required disk flatness and stability during high-speed rotation. Large-scale dynamic simulation is used to track the response of the recording head slider-foil disk interface due to mechanical shock in the vertical, pitch, and roll directions. Results are described and compared with those of the configuration that includes helium and a HD. Attention is focused on response to off-design conditions that can create head crash with the HD.

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References

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Nigam, A., and White, J., 2013, “Enhancement of Hard Disk Drive Performance by Using Thin Titanium Foil Disk Substrates,” ASME Paper No. ISPS2013-2807. [CrossRef]
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White, J., 2006, “Design of Optimized Opposed Slider Air Bearings for High Speed Recording on a Metal Foil Disk,” ASME J. Tribol., 128(2), pp. 327–334. [CrossRef]
White, J., 2008, “Air Bearing Interface Characteristics of Opposed Asymmetric Recording Head Sliders Flying on a One Inch Titanium Foil Disk,” ASME J. Tribol., 130(4), p. 041902. [CrossRef]
Okawa, S., and Watanabe, K., 2009, “Chemical Mechanical Polishing of Titanium With Colloidal Silica Containing Hydrogen Peroxide-Mirror Polishing and Surface Properties,” Dent. Mater. J., 28(1), pp. 68–74. [CrossRef] [PubMed]
Fukui, S., and Kaneko, R., 1988, “Analysis of Ultra-Thin Gas Film Lubrication Based on Linearized Boltzmann Equation: First Report-Derivation of a Generalized Lubrication Equation Including Thermal Creep Flow,” ASME J. Tribol., 110(2), pp. 253–262. [CrossRef]
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Figures

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Fig. 1

Recording head slider-foil disk interface

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Fig. 2

The vacuum cavity slider configuration

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Fig. 3

Bearing minimum clearance sensitivity to slider preload force

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Fig. 4

Static pressure contours (atm) for side-1 slider

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Fig. 5

Response to a vertical impulse toward the disk (a) fly height as a function of time and (b) change in pitch angle as a function of time

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Fig. 6

Pressure response at a fixed slider location due to a vertical impulse toward the disk

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Fig. 7

Pressure profile over slider following a vertical impulse toward the HD

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Fig. 8

Disk deflection profiles following a vertical impulse toward the titanium foil disk (a) first relative minimum of the side-1 minimum fly height, (b) first relative maximum of the side-1 minimum fly height, and (c) second relative minimum of the side-1 minimum fly height

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Fig. 9

Comparison of damping characteristics for helium and air (a) side-1 slider and (b) side-0 slider

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Fig. 10

Fly height response to a vertical impulse for several values of foil disk thickness

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Fig. 11

Response to a pitch moment impulse applied to side-1 slider (a) fly height as a function of time and (b) change in pitch angle as a function of time

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Fig. 12

Response to a roll moment impulse applied to side-1 slider (a) fly height as a function of time, (b) change in pitch angle as a function of time, and (c) change in roll angle as a function of time

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Fig. 13

Pressure profile just before contact due to roll impulse for HD

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Fig. 14

Pressure contours (atm) due to roll impulse for titanium foil disk

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Fig. 15

Response to simultaneous impulses in the vertical, pitch, and roll directions (a) fly height as a function of time, (b) change in pitch angle as a function of time, and (c) change in roll angle as a function of time

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