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Measurement and modelling of disturbances in a servo track writer and advanced loop shaping to achieve higher track density

Data Storage Institute, A*STAR, Singapore

^* To whom correspondence should be addressed. E-mail: zhang_jingliang{at}dsi.a-star.edu.sg.

	Abstract

In this paper we present the idea of hybrid servo track writing and give a complete description of the developed hybrid servo track writer platform including its main functions and servo mechanism. The major disturbances and noise level in media-level servo track writing are identified based on the position error signal measured on the hybrid servo track writer platform. A dual-stage servo system, which is applicable in servo writing, is proposed and implemented on the experimental platform. With the disturbances and noise models, an advanced loop-shaping scheme based on Kalman–Yakubovic–Popov lemma is used to optimize the controller for the micro-actuator servo loop. The experimental results show that the tracking accuracy can reach 6 nm, which is able to support a track density of more than 400 000 tracks per inch.

First published on September 8, 2009
Transactions of the Institute of Measurement and Control 2009, doi:10.1177/0142331209339884


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