High-bandwidth servo control designs for magnetic disk drives

2002 ◽  
Author(s):  
M. Kobayashi ◽  
S. Nakagawa ◽  
T. Atsumi ◽  
T. Yamaguchi
Keyword(s):  
Servo Control ◽  
Disk Drives ◽  
Magnetic Disk ◽  
High Bandwidth ◽  
Control Designs

High-Bandwidth Servo Design for Shaping Primary Arm-Resonance in Magnetic Disk Drives

2000 ◽  
Vol 2000.2 (0) ◽  
pp. 201-202 ◽  
Author(s):  
Takenori ATSUMI ◽  
Shinsuke NAKAGAWA ◽  
Takashi YAMAGUCHI ◽  
Yousuke HAMADA ◽  
Hiroyuki OHSAWA ◽  
...  
Keyword(s):  
Disk Drives ◽  
Magnetic Disk ◽  
High Bandwidth

Dual-Stage Servo Control for an Optical Pointing System

2013 ◽  
Author(s):  
Eric D. Miller ◽  
Raymond A. de Callafon
Keyword(s):  
Power Consumption ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Single Stage ◽  
Servo Control ◽  
Disk Drives ◽  
Bandwidth Control ◽  
High Bandwidth ◽  
Dual Stage ◽  
Reduced Power Consumption

In the realm of hard disk drives (HDD), dual-stage servo control has been shown to achieve increased control bandwidth and reduced power consumption compared to single-stage architectures [1]–[4]. Motivated by these results, we seek to apply dual-stage control to an analogous case of an optical pointing system, which has similar objectives of high-bandwidth control over a wide spatial range.

Failure analysis of laser-textured surfaces

2000 ◽  
Vol 214 (5) ◽  
pp. 471-483 ◽  
Author(s):  
S Chilamakuri ◽  
X Zhao ◽  
B Bhushan
Keyword(s):  
Plastic Deformation ◽  
Operating Conditions ◽  
Disk Drives ◽  
Critical Number ◽  
Textured Surfaces ◽  
Tribological Behaviour ◽  
Magnetic Disk ◽  
Size And Shape ◽  
Ultrahigh Density ◽  
Theoretical Results

Friction/stiction behaviour of ultrahigh-density magnetic disk drives can be controlled by controlling the size and shape of the laser bumps. Tribological behaviour of laser-textured disk surfaces depends on the size and shape of the laser bumps, bump density and operating conditions. In this study, theoretical and experimental analyses have been carried out on nine different laser-textured disk surfaces. Stiction and friction experiments have been carried out on sombrero, V-type and W-type laser-textured disks and these results are compared with theoretical results. A good correlation is obtained between experimental and theoretical results. The effect of laser bump uniformity on critical number of bumps required to prevent plastic deformation and stiction has also been studied.

Depletion of Moleculary Thin Lubricant Under Flying Head in Hard Disk Drives

2007 ◽  
Author(s):  
Kenji Yanagisawa ◽  
Youichi Kawakubo ◽  
Masato Yoshino
Keyword(s):  
Thin Film ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Lubricant Film ◽  
Simulation Program ◽  
Disk Drives ◽  
Lubricant Thickness ◽  
Magnetic Disk ◽  
Lubricant Depletion ◽  
Lubricant Films

In Hard Disk Drives, lubricants are very important materials to reduce head and disk wear. Therefore, it is necessary to know the lubricant depletion under flying heads. Lubricant depletion due to flying heads has been studied experimentally. We developed simulation program to calculate numerically the change in lubricant thickness under a flying head on a thin-film magnetic disk from 10nm thick lubricant film. In recent HDDs, the lubricants thickness has become molecularly thin and polar lubricants have been used. In this paper, we took account of thickness-dependent lubricants diffusion and viscosity in our simulations to calculate a 1.2 nm thick polar lubricant film used in recent HDDs. The simulated results considering the thickness-dependent diffusion and viscosity showed that depletion was small in molecularly thin lubricant films. We considered it necessary to include thickness-dependent diffusion and viscosity in lubricant depletion simulation.

scholarly journals Adaptive Seeking Control for Magnetic Disk Drives.

2000 ◽  
Vol 43 (2) ◽  
pp. 300-305 ◽  
Author(s):  
Masahito KOBAYASHI ◽  
Takashi YAMAGUCHI ◽  
Hiromu HIRAI
Keyword(s):  
Disk Drives ◽  
Magnetic Disk
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