An overview of the PES Pareto Method for decomposing baseline noise sources in hard disk position error signals

Abramovitch, Daniel Y.; Hurst, Terril N.; Henze, Dick

doi:10.1109/20.663429

Cited by 52 publications

(14 citation statements)

References 10 publications

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“…Therefore, we first have to consider reducing the position error signal (PES). Abramovitch et al investigated the PES Pareto method to identify disturbance sources and found that windage and PES baseline noise were the two most significant sources [1]. Then Yamaguchi et al proposed a design tool for evaluating track misregistration (TMR) for disk drives [2].…”

Section: Introductionmentioning

confidence: 98%

Written-In RRO and NRRO Characteristics in Mobile Hard Disk Drives

Akagi

Usui

2009

IEEE Trans. Magn.

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The characteristics of repeatable runout (RRO) and nonrepeatable runout (NRRO) of hard disk drives (HDDs) have to be determined for higher tracks per inch since the static positional accuracy has almost reached its limit. To break this limit, it is necessary to identify precisely these track misregistration characteristics. We experimentally estimated the actual component of disturbances in both servowriting and the actual drive using a mixture of helium and air. In the study described in this paper, windage or flow-induced vibration in servo-writing was the dominant component as a torque disturbance in the drive measurement. We then found that written-in RRO was key to understanding the characteristics of disturbances. As a result, the most dominant component in NRRO and even in written-in RRO is torque disturbance followed by positional disturbance for mobile HDDs.Index Terms-Flow-induced vibration (FIV), helium, nonrepeatable runout (NRRO), position error signal (PES), servo-write, torque disturbance, track misregistration (TMR), tracks per inch, written-in RRO.

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Section: Introductionmentioning

confidence: 98%

Written-In RRO and NRRO Characteristics in Mobile Hard Disk Drives

Akagi

Usui

2009

IEEE Trans. Magn.

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“…The requirement of higher TPI demands more precise and smaller motion of the actuator arm, which exerts more difficulties on track following and single-track seeking. Consequently, it has posted a great challenge to the design of servo controllers for the moving parts of the information storage devices, as the current industrial servo design techniques may no longer be able to deliver the required accuracy and speed, which is due to either the fundamental performance limitations coming from the artificial constraint of using only linear controller structures [16,17,18,19]. In order to capture effects of these nonlinearities, certain nonlinear models are needed.…”

Section: Introductionmentioning

confidence: 99%

Modeling and cancellation of pivot nonlinearity in hard disk drive

Gong

Lin²,

Lee³

et al. 2002

Proceedings of the 2002 American Control Conference (IEEE Cat. No.CH37301)

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In this paper, the modeling issue of the pivot nonlinearity in a typical hard disk drive is considered. Viscous friction, Coulomb friction and hysteresis effects are taken into account. Based on the proposed model, a nonlinear compensator is designed to make the compensated system to behave like a double integrator regardless of the magnitude of the input current. Extensive experiments are then carried out in both time domain and frequency domain to show the effects of pivot nonlinearity and the effectiveness of the proposed compensator.

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“…This means that servo control needs to perform well in both low and middle frequency range. Conventionally loop shaping or disturbance observer [1,2] is used to improve the disturbance rejection, but the performance in the middle or high frequency range is sacrificed due to the water-bed effect [3,4]. Fig.…”

Section: Introductionmentioning

confidence: 99%

Add-on feedforward disturbance compensation for vibration suppression in HDD

Wang

2009

2009 IEEE International Conference on Control and Automation

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The applications of HDD in mobile and compact devices pose higher requirement on the vibration rejection capability of HDD servo control. A novel vibration suppression method is proposed in this paper. It is not model based, so it is less sensitive to the variation of the plan parameters. It avoids obtaining disturbance observation by differentiation of position signal. It is an add-on feedforward scheme therefore it is easy to be on/off; through proper on/off of this add-on feature in different environments, the water-bed can be avoided and the vibration rejection is achieved without sacrificing the performance in other frequencies. The experimental results show the effectiveness of the scheme.

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An overview of the PES Pareto Method for decomposing baseline noise sources in hard disk position error signals

Cited by 52 publications

References 10 publications

Written-In RRO and NRRO Characteristics in Mobile Hard Disk Drives

Written-In RRO and NRRO Characteristics in Mobile Hard Disk Drives

Modeling and cancellation of pivot nonlinearity in hard disk drive

Add-on feedforward disturbance compensation for vibration suppression in HDD

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