Much research work has recently been carried out on increasing the density of recording on a first-surface optical disk by using the combination of a blue-violet laser diode and high-NA lens. To achieve a higher-densities of recording for removable magneto-optical (MO) disk, an optical flying head (OFH) with an integrated magnetic field modulation (MFM) coil and high-NA lens has been developed by the project, which was conducted by OITDA under a contract from NEDO with funds provided by the Ministry of Economy Trade and Industry of Japan. The combination of the OFH and high-density media technology is expected to lead to an areal density of 100 Gb/in{sup}2 and a data-transfer rate of 100 Mbps. In this paper, we give an overview of an optical disk system using an OFH that is suitable for use with removable MO media. We also present the structure of a mechanism for high-precision tracking by this system.
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