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.

References

References
1.
Aruga
,
K.
,
Suawa
,
K.
,
Shimizu
,
K.
, and
Watanabe
,
T.
,
2007
, “
A Study of Positioning Error Caused by Flow Induced Vibration Using Helium-Filled Hard Disk Drives
,”
IEEE Trans. Magn.
,
43
(
9
), pp.
3750
3755
.10.1109/TMAG.2007.902983
2.
Yang
,
J.
,
Tan
,
C. P.
, and
Ong
,
E. H.
,
2010
, “
Heat Transfer Enhancement by Helium Gas Filled in a Hard Disk Drive Enclosure
,”
ASME
Paper No. IMECE2010-37622.10.1115/IMECE2010-37622
3.
Liu
,
N.
,
Zheng
,
J.
, and
Bogy
,
D. B.
,
2011
, “
Thermal Flying-Height Control Sliders in Air-Helium Mixtures
,”
IEEE Trans. Magn.
,
47
(
1
), pp.
100
104
.10.1109/TMAG.2010.2080313
4.
Nigam
,
A.
, and
White
,
J.
,
2013
, “
Enhancement of Hard Disk Drive Performance by Using Thin Titanium Foil Disk Substrates
,”
ASME
Paper No. ISPS2013-2807.10.1115/ISPS2013-2807
5.
Nigam
,
A.
, and
White
,
J.
,
2012
, “
High Capacity Disk Drive Using Thin Foil Disks at Elevated Rotational Speeds
,” U.S. Patent No. 8,111,481.
6.
Nigam
,
A.
, and
White
,
J. W.
,
1999
, “
Metal Foil Disk for High Areal Density Recording in Environments of High Mechanical Shock
,” U.S. Patent No. 5,968,627.
7.
Washburn
,
H.
,
2000
, “
Systems and Methods for Making a Magnetic Recording Medium on a Flexible Metal Substrate
,” U.S. Patent No. 6,113,753.
8.
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
.10.1115/1.2162917
9.
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
.10.1115/1.2966386
10.
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
.10.4012/dmj.28.68
11.
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
.10.1115/1.3261594
12.
White
,
J.
,
2012
, “
A Lubrication Equation Incorporating Two-Dimensional Roughness Effects, With Emphasis on the Patterned Data Islands of a Recording Disk
,”
ASME J. Tribol.
,
134
(
1
), p.
011901
.10.1115/1.4005519
13.
Benson
,
R. C.
, and
Bogy
,
D. B.
,
1978
, “
Deflection of a Very Flexible Spinning Disk Due to a Stationary Transverse Load
,”
ASME J. Appl. Mech.
,
45
(
3
), pp.
636
642
.10.1115/1.3424374
14.
Adams
,
G. G.
,
1980
, “
Procedures for the Study of the Flexible-Disk to Head Interface
,”
IBM J. Res. Dev.
,
24
(
4
), pp.
512
517
.10.1147/rd.244.0512
15.
Benson
,
R. C.
, and
Takahashi
,
T. T.
,
1991
, “
Mechanics of Flexible Disks in Magnetic Recording
,”
Adv. Inf. Storage Syst.
,
1
(
1
), pp.
15
35
.10.1016/0963-8687(91)90004-3
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