Shock response analysis on thermal stick–slip phenomenon in hard disk drive

2012 ◽  
Vol 18 (9-10) ◽  
pp. 1507-1512 ◽  
Author(s):  
Hajime Eguchi ◽  
Isao Kobayashi
Keyword(s):  
Hard Disk Drive ◽  
Hard Disk ◽  
Disk Drive ◽  
Response Analysis ◽  
Stick Slip ◽  
Shock Response ◽  
Slip Phenomenon

Optimization of Air Bearing Contours for Shock Performance of a Hard Disk Drive

2003 ◽  
Author(s):  
Eric M. Jayson ◽  
Frank E. Talke
Keyword(s):  
Hard Disk Drive ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drive ◽  
Element Model ◽  
Time Dependent ◽  
Air Bearing ◽  
Disk Interface ◽  
Shock Response ◽  
Shock Event

Hard disk drives must be designed to withstand shock during operation. Large movements of the slider during shock impulse can cause reading and writing errors, track misregistration, or in extreme cases, damage to the magnetic material and loss of data. The design of the air bearing contour determines the steady state flying conditions of the slider as well as dynamic flying conditions, including shock response. In this paper a finite element model of the hard disk drive mechanical components was developed to determine the time dependent forces and moments applied to the slider during a shock event. The time dependent forces and moments are applied as external loads in a solution of the dynamic Reynolds equation to determine the slider response to a shock event. The genetic algorithm was then used to optimize the air bearing contour for optimum shock response while keeping the steady flying conditions constant. The results show substantial differences in the spacing modulation of the head/disk interface after a shock as a function of the design of the air bearing contour.

SHOCK RESPONSE OF THE CLAMPED DISK IN SMALL FORM FACTOR HARD DISK DRIVE

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1592-1597 ◽  
Author(s):  
BIN GU ◽  
DONGWEI SHU ◽  
BAOJUN SHI ◽  
GUOXING LU
Keyword(s):  
Finite Element ◽  
Form Factor ◽  
Hard Disk Drive ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drive ◽  
Element Model ◽  
Small Form ◽  
Shock Response ◽  
Small Form Factor

As small form factor (one-inch and smaller) hard disk drives are widely used in portable consumer appliances and gadgets, their mechanical robustness is of greater concern. In the previous work, it is found that when the disk is more tightly clamped, it helps to decrease the shock response of the disk and then avoid the head slap. In this paper, the real boundary condition of the disk for a small form factor hard disk drive from Seagate is investigated numerically. The disk is clamped between the clamp and the hub. The shock response of the disk under a half-sine acceleration pulse is simulated by using the finite element method. In the finite element model, both contact between disk and clamp and contact between disk and hub are considered. According to the simulation results, how to decrease the shock response of the disk is suggested.

scholarly journals Effect of suspension design on the non-operational shock response in a load/unload hard disk drive

2009 ◽  
Vol 16 (1-2) ◽  
Author(s):  
Hao Zheng ◽  
Aravind N. Murthy ◽  
Edmund B. Fanslau ◽  
Frank E. Talke
Keyword(s):  
Hard Disk Drive ◽  
Hard Disk ◽  
Disk Drive ◽  
Shock Response ◽  
Operational Shock

Optimization of Air Bearing Contours for Shock Performance of a Hard Disk Drive

2005 ◽  
Vol 127 (4) ◽  
pp. 878-883 ◽  
Author(s):  
Eric M. Jayson ◽  
Frank E. Talke
Keyword(s):  
Hard Disk Drive ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drive ◽  
Element Model ◽  
Time Dependent ◽  
Air Bearing ◽  
Disk Interface ◽  
Shock Response ◽  
Shock Event

Hard disk drives must be designed to withstand shock during operation. Large movements of the slider during a shock impulse can cause reading and writing errors, track misregistration, or in extreme cases, damage to the magnetic material and loss of data. The design of the air bearing contour determines the steady-state flying conditions of the slider as well as dynamic flying conditions, including shock response. In this paper a finite element model of the hard disk drive mechanical components was developed to determine the time dependent forces and moments applied to the slider during a shock event. The time-dependent forces and moments are applied as external loads in a solution of the dynamic Reynolds equation to determine the slider response to a shock event. The genetic algorithm was then used to optimize the air bearing contour for optimum shock response while keeping the steady flying conditions constant. The results show substantial differences in the spacing modulation of the head-disk interface after a shock as a function of the design of the air bearing contour.

The pulse width effect on the shock response of the hard disk drive

2007 ◽  
Vol 34 (8) ◽  
pp. 1342-1349 ◽  
Author(s):  
J. Luo ◽  
D.W. Shu ◽  
B.J. Shi ◽  
B. Gu
Keyword(s):  
Hard Disk Drive ◽  
Pulse Width ◽  
Hard Disk ◽  
Disk Drive ◽  
Shock Response ◽  
Width Effect

Shock Response of a Small Form Factor Hard Disk Drive With Air Bearing Interface Fully Coupled

2007 ◽  
Author(s):  
Jih-Ping Peng ◽  
Yu-Min Lee
Keyword(s):  
Form Factor ◽  
Hard Disk Drive ◽  
Degrees Of Freedom ◽  
Reynolds Equation ◽  
Hard Disk ◽  
Disk Drive ◽  
Air Bearing ◽  
Small Form ◽  
Shock Response ◽  
Small Form Factor

The present paper investigates the shock response of a small form factor hard disk drive (HDD). Both the air bearing and the entire HDD structure are considered in the model. The air bearing is described by the compressible Reynolds equation. The HDD structure is modeled by the finite element method. The Guyan reduction method is used to reduce the number of degrees of freedom to manageable size. CML Dynamic Simulator is used to solve the coupled structure equations and air bearing Reynolds equation.

Sign in / Sign up

Export Citation Format

Share Document