Rejection of Unknown Periodic Disturbances in Magnetic Hard Disk Drives

2006 ◽  
Author(s):  
M. Nagashima ◽  
K. Usui ◽  
M. Kobayashi
Keyword(s):  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drives ◽  
Periodic Disturbances ◽  
Magnetic Hard Disk

Rejection of Unknown Periodic Disturbances in Magnetic Hard Disk Drives

2007 ◽  
Vol 43 (9) ◽  
pp. 3774-3778 ◽  
Author(s):  
M. Nagashima ◽  
K. Usui ◽  
M. Kobayashi
Keyword(s):  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drives ◽  
Periodic Disturbances ◽  
Magnetic Hard Disk

Tribology challenges of modern magnetic hard disk drives

Wear ◽  
2001 ◽  
Vol 251 (1-12) ◽  
pp. 1124-1132 ◽  
Author(s):  
Andrei Khurshudov ◽  
Robert J. Waltman
Keyword(s):  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drives ◽  
Magnetic Hard Disk

A Numerical Simulation of the Head-Disk Assembly in Magnetic Hard Disk Files: Part I—Component Models

1990 ◽  
Vol 112 (4) ◽  
pp. 593-602 ◽  
Author(s):  
O. J. Ruiz ◽  
D. B. Bogy
Keyword(s):  
Numerical Simulation ◽  
Natural Frequencies ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Coupled System ◽  
Air Bearing ◽  
Disk Drives ◽  
Air Bearings ◽  
Magnetic Hard Disk ◽  
Component Models

In previous papers the dynamics of air bearing sliders used to carry the read/write transducers in magnetic hard disk files has been studied. These studies are useful in evaluating the steady flying and stability of sliders subjected to various disturbances. They are particularly useful in finding the natural frequencies of the air bearings. However, in hard disk drives the sliders are attached to suspensions, which are highly specialized structures that connect the sliders to the positioning actuators. These suspensions have to be relatively stiff in lateral translation, but very flexible in pitch and roll. This latter feature is accomplished by the gimbal or flexure that connects the slider to the end of the suspension. The suspension-gimbal structure has its own natural frequencies, which can be excited by disturbances such as track seeking and impacting the actuator against the crash stop. In order to study the effect of these structures on the head-disk spacing it is necessary to include them in the numerical simulator. In this two part study such a simulator is developed. In Part I the component parts and their interfaces are modeled. In Part II the numerical simulation of the coupled system is accomplished and the numerical results of several sample simulations are presented and discussed.

Air Film Dynamics for Micro-Textured Flying Head Slider Bearings in Magnetic Hard Disk Drives

2002 ◽  
Vol 124 (3) ◽  
pp. 568-574 ◽  
Author(s):  
Norio Tagawa ◽  
David B. Bogy
Keyword(s):  
Hard Disk Drives ◽  
Hard Disk ◽  
Longitudinal Direction ◽  
Mode Shapes ◽  
Disk Drives ◽  
Head Slider ◽  
Slider Bearings ◽  
Magnetic Hard Disk ◽  
Film Stiffness ◽  
Air Film

This paper describes the air film dynamics for micro-textured flying head slider bearings in magnetic hard disk drives and it discusses their ability to increase the air film damping. In order to study the effects of micro-textures on air film dynamic characteristics of flying head slider bearings, two-dimensional micro-textures are modeled as deterministic rectangular models in the transverse and longitudinal directions. Dynamic analysis of these micro-textured flying head slider bearings is carried out by computing the impulse responses of the sliders and applying the modal analysis method to obtain their modal frequencies, damping ratios, and mode shapes. It is found that micro-textures on air bearing surfaces in the transverse direction have very significant effects and increase the air film damping of the slider’s three vibration modes but do not affect the air film stiffness. The same is not true for micro-texture in the longitudinal direction. The effects of transverse micro-textures’ spacing and depth on the air film dynamics are also numerically investigated in detail. The optimum values for high air film damping ratios are obtained. It is found that transverse micro-textures having small spacing are not very effective, being equivalent to the surface roughness effect.

The flying height analysis of patterned sliders in magnetic hard disk drives

2005 ◽  
Vol 11 (1) ◽  
pp. 23-31 ◽  
Author(s):  
W.-L. Li ◽  
S.-C. Lee ◽  
C.-W. Chen ◽  
F.-R. Tsai ◽  
M.-D. Chen ◽  
...  
Keyword(s):  
Hard Disk Drives ◽  
Hard Disk ◽  
Flying Height ◽  
Disk Drives ◽  
Magnetic Hard Disk
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