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Digital servo control plays a significant role in the modern high capacity disc drives by accurately positioning the read write head over a data track, or by moving the head to alternate data tracks. Disc drive involves complex and advanced technologies. This book focuses on the servo mechanical subsystem, it's design and analysis, for a high capacity disc drive digital control system design and includes the overview of the various disc drive components, to mainly solicit the understandings to how such components affect the digital servo controller design requirements, which probably one of the most advanced application of modern linear control system theory. Analysis approach presents proactive resolution for any design issues that might limit the control system performance.