Fast One-track Seeking for Nearline HDDs using Iterative Learning Control

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  • 学習制御を用いたニアラインＨＤＤの隣接トラックシーク高速化手法

Abstract

<p>For nearline HDDs used in data centers, it is important to improve the positioning accuracy of read/write heads and track seeking speed in one-track seeking control, which is continuously invoked during large data read/write operations. This paper proposes a one-track seeking control that uses iterative learning control to shape the feedforward input waveform of a PZT actuator of a dual-stage actuator at each seek. The effectiveness of the proposed method is verified by one-track seeking simulation using the HDD benchmark problem for a dual-stage actuator. The proposed method shows better read/write head positioning accuracy than the conventional method. In addition, the error 2-norm of the learning control can be easily monotonically decreased by adjusting the learning gain.</p>

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