Identification of Pure Tones Radiated by Brushless D. C. Motors Used in Computer Disk Drives

1992 ◽  
Vol 39 (2) ◽  
pp. 67 ◽  
Author(s):  
Ming-ran Lee ◽  
Rajendra Singh
Keyword(s):  
Disk Drives ◽  
Pure Tones ◽  
Computer Disk

Particle detachment from disk surfaces of computer disk drives

1991 ◽  
Vol 22 (6) ◽  
pp. 737-746 ◽  
Author(s):  
Chuen-Jinn Tsai ◽  
David Y.H. Pui ◽  
Benjamin Y.H. Liu
Keyword(s):  
Disk Drives ◽  
Particle Detachment ◽  
Computer Disk

Optimal Sliding Mode Dual-Stage Actuator Control in Computer Disk Drives

2010 ◽  
Vol 132 (4) ◽  
Author(s):  
Seung-Hi Lee
Keyword(s):  
Discrete Time ◽  
Sliding Mode ◽  
Voice Coil Motor ◽  
Disk Drives ◽  
Flexible Mode ◽  
Control Scheme ◽  
Dual Stage ◽  
Actuator Control ◽  
Dual Stage Actuator ◽  
Computer Disk

This paper presents a discrete-time design of a dual-stage actuator control system with sliding mode for computer disk drives. A state estimator based discrete-time boundary layer sliding mode control scheme is developed for a dual-stage actuator, which consists of a voice coil motor and a microactuator. Considering dominant microactuator flexible mode dynamics and the interaction between the two actuators, an optimal sliding hyperplane is designed to maximize their cooperation so as to attain desired responses. An application example demonstrates the utility of the proposed sliding mode dual-stage actuator control scheme for track-seek in the microactuator range, settle, and track-follow.

Mode localization in computer disk drives

1992 ◽  
Author(s):  
CEMIL ORHAN ◽  
BENSON TONGUE
Keyword(s):  
Disk Drives ◽  
Mode Localization ◽  
Computer Disk

Servo design for high-TPI computer disk drives using a delay-accommodating state estimator

2005 ◽  
Vol 11 (8-10) ◽  
pp. 696-701
Author(s):  
Young-Hoon Kim ◽  
Sang-Hoon Chu ◽  
Seong-Woo Kang
Keyword(s):  
Disk Drives ◽  
State Estimator ◽  
Computer Disk

Kinetic Meniscus Model for Prediction of Rest Stiction

1998 ◽  
Vol 120 (1) ◽  
pp. 42-50 ◽  
Author(s):  
B. Bhushan ◽  
C. A. Kotwal ◽  
S. K. Chilamakuri
Keyword(s):  
Static Friction ◽  
Disk Drives ◽  
Equilibrium Time ◽  
Smooth Disk ◽  
Asperity Contacts ◽  
Rest Time ◽  
First Time ◽  
Stationary Contact ◽  
Computer Disk ◽  
Meniscus Model

The time dependence of static friction is an important aspect of tribological studies whereby the static friction increases with an increase in the time of stationary contact (rest static friction or rest stiction). This effect is commonly observed in computer disk drives especially at high humidities, in which the static friction increases rapidly with an increase in rest time between some head slider and the disk surfaces. For the first time, a comprehensive kinetic meniscus model is proposed to explain this phenomenon, both for a single asperity and multiple asperity contacts at a liquid mediated interface. It is found that the static friction increases up to a certain equilibrium time with a power law relationship after which it remains constant. The equilibrium time is dependent on the liquid film thickness, the liquid viscosity and the contact geometry. The model developed is applied to a rough textured disk, a polished disk and a super smooth disk. To study the effect of the scan size on the meniscus force, the static friction is calculated by using roughness parameters obtained from measurements at different scan sizes.

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