Air Bearing Simulation for Bit Patterned Media

2008 ◽  
Author(s):  
Hui Li ◽  
Hao Zheng ◽  
Yeoungchin Yoon ◽  
Frank E. Talke
Keyword(s):  
Thermal Stability ◽  
Steady State ◽  
Disk Surface ◽  
Hard Disks ◽  
Air Bearing ◽  
Bit Patterned Media ◽  
Patterned Media ◽  
Storage Density ◽  
Low Head ◽  
Disk Spacing

Patterned media is being considered as a means for achieving a storage density beyond 1Tb/in2 on hard disks by reducing cross talk and overcoming thermal stability problems. In this investigation, the flying characteristics of a femto-type slider over bit patterned media (BPM) is investigated. The discrete bits of the disk are modeled as cylindrical protrusions on the disk surface. The steady-state flying characteristics over BPM at ultra-low head disk spacing is simulated.

Role of Dipolar Interactions on the Thermal Stability of High-Density Bit-Patterned Media

2012 ◽  
Vol 3 ◽  
pp. 4500204-4500204 ◽  
Author(s):  
N. Eibagi ◽  
J. J. Kan ◽  
F. E. Spada ◽  
E. E. Fullerton
Keyword(s):  
Thermal Stability ◽  
High Density ◽  
Dipolar Interactions ◽  
Bit Patterned Media ◽  
Patterned Media ◽  
Thermal Stability Of

scholarly journals Iterative Signal Detection Scheme Using Multilayer Perceptron for a Bit-Patterned Media Recording System

2020 ◽  
Vol 10 (24) ◽  
pp. 8819
Author(s):  
Seongkwon Jeong ◽  
Jaejin Lee
Keyword(s):  
Signal Detection ◽  
Data Storage ◽  
Multilayer Perceptron ◽  
A Priori ◽  
Magnetic Data ◽  
Bit Patterned Media ◽  
Detection Scheme ◽  
Patterned Media ◽  
Storage Density ◽  
Priori Information

Because of the physical and engineering problems of conventional magnetic data storage systems, bit-patterned media recording (BPMR) is expected to be a promising technology for extending the storage density to beyond 1 Tb /in2. To increase the storage density in BPMR systems, the separation between islands in both down- and cross-track directions must be reduced; this reduction results in two-dimensional interference from neighboring symbols in those directions, which is a major performance degradation factor in BPMR. Herein, we propose an iterative signal detection scheme between a Viterbi detector and a multilayer perceptron to improve the performance of a BPMR system. In the proposed signal detection scheme, we use the modified output of a multilayer perceptron as a priori information to improve equalization and extrinsic information to decrease the effect of intertrack interference.

Air Bearing Simulation for Bit Patterned Media

2009 ◽  
Vol 33 (3) ◽  
pp. 199-204 ◽  
Author(s):  
Hui Li ◽  
Hao Zheng ◽  
Yeoungchin Yoon ◽  
Frank E. Talke
Keyword(s):  
Air Bearing ◽  
Bit Patterned Media ◽  
Patterned Media

Air bearing dynamic stability on bit patterned media disks

2013 ◽  
Vol 19 (9-10) ◽  
pp. 1401-1406 ◽  
Author(s):  
Liping Li ◽  
David B. Bogy
Keyword(s):  
Dynamic Stability ◽  
Air Bearing ◽  
Bit Patterned Media ◽  
Patterned Media

Air Bearing Flying Characteristics on Patterned Media

2007 ◽  
Author(s):  
Wei Peng ◽  
Robert M. Crone ◽  
Emil Esmenda ◽  
Yiao-Tee Hsia
Keyword(s):  
Steady State ◽  
Air Bearing ◽  
Skew Angle ◽  
Simulation Code ◽  
Noticeable Effect ◽  
Patterned Media ◽  
Fly Height ◽  
Height Drop

The air bearing steady-state flying characteristics on patterned media has been studied with a proprietary air bearing simulation code. Variation of minimum fly height with relative pattern-to-slider skew has been characterized at slider positions (ID, MD, OD). The results show that at the steady state minimum fly heights drop with introducing the pattern. Furthermore, the pattern-to-slider skew angle has a noticeable effect on the fly height drop, while the maximum fly height drop occurs on radial servo patterns.

Analysis of Bouncing Vibrations of a 2-DOF Tripad Contact Slider Model With Air Bearing Pads Over a Harmonic Wavy Disk Surface

1999 ◽  
Vol 121 (4) ◽  
pp. 939-947 ◽  
Author(s):  
Kyosuke Ono ◽  
Kan Takahashi
Keyword(s):  
Contact Stiffness ◽  
Disk Surface ◽  
Design Parameters ◽  
Air Bearing ◽  
Static Contact ◽  
Tracking Ability ◽  
The Coefficient Of Friction ◽  
Bearing Stiffness ◽  
Perfect Contact ◽  
Contact Slider

In this study, the authors numerically analyzed the bouncing vibrations of a two-degree-of-freedom (2-DOF) model of a tripad contact slider with air bearing pads over a harmonic wavy disk surface. The general features of bouncing vibrations were elucidated in regard to the modal characteristics of a 2-DOF vibration system and design parameters such as contact stiffness, contact damping, air hearing stiffness, the rear to front air bearing stiffness ratio, static contact force and the coefficient of friction. The design of a contact slider was discussed in terms of tracking ability and wear durability. In addition, two sample designs of a perfect contact slider with sufficient wear durability were also presented.

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