DAC quantization noise reduction for servo control systems in hard disk drives

2004 ◽  
Author(s):  
Wei-Min Lu ◽  
R. Wood ◽  
M. Yu
Keyword(s):  
Noise Reduction ◽  
Control Systems ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Servo Control ◽  
Quantization Noise ◽  
Disk Drives

Head-Positioning Control of Hard Disk Drives Through the Integrated Design of Mechanical and Control Systems

2009 ◽  
Vol 3 (3) ◽  
pp. 277-285 ◽  
Author(s):  
Takenori Atsumi ◽  
Keyword(s):  
Control Systems ◽  
Hard Disk Drives ◽  
Integrated Design ◽  
Hard Disk ◽  
Disk Drive ◽  
Nanometer Scale ◽  
Disk Drives ◽  
Positioning Control ◽  
Head Positioning ◽  
And Control

A Hard Disk Drive (HDD) is an inexpensive mass-production product, but the head-positioning control systems of HDDs require nanometer-scale positioning performance. Therefore, we have studied head-positioning control systems of HDD using designs which integrate mechanical and control systems to improve their control performance while curbing cost increases. In this paper, we introduce “disturbance suppression in high-frequency ranges through phase stable design for high-order mechanical resonances” and “high servo-bandwidth design through mode shape design of mechanical resonance” as examples of techniques that have been developed and are easily applied to products.

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.

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