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Flexible optical disk system with a sample servo format

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Abstract

A high-capacity 90-mm flexible optical disk system with a phase-change rewritable disk is studied, aiming at low-cost recording media and small drives. The flexible disk rotates stably and is supported by two thrust air bearings fabricated in a plastic cartridge with a disk tilt of less than 5 mrad. A radial tracking-control precision of 0.2 μm is attained with a sample servo system by using photographically replicated square servo marks on the disk. The feasibility of this system is confirmed by write–erase operations in a 2-μm track pitch.

© 1992 Optical Society of America

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