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AssigneeFuji Photo Film Co., Ltd.
InventorsMasakazu Nishikawa, Kazuyuki Usuki, Yoshihisa Usami, Makoto Nagao
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There are provided an information recording medium which permits accurate tracking servo, and a method for recording and reproducing for an information recording medium which allows recording and reproducing of a signal at a favorable S/N by carrying out at least one of information recording and information reproduction while accurately performing tracking servo. A magneto-optic disk includes a magnetic recording layer for magnetically recording information. The magnetic recording layer is in advance magnetized for concentrically or spirally around the center of the disk in such a manner that magnetized regions are disposed such that adjacent regions are magnetized in different directions and alternately arranged in the radial direction of the disk. Accordingly, tracking can be continuously performed and accurate tracking servo can also be performed.
An information recording disk-shaped medium comprising a substrate with a magnetic recording layer disposed thereon for magnetically recording information,
A method for recording and reproducing for an information recording disk-shaped medium, in which the information recording medium comprises a substrate with a magnetic recording layer disposed thereon for magnetically recording information, the magnetic recording layer being in advance magnetized concentrically or spirally around a center of the substrate for tracking and being disposed in such a manner that magnetized regions magnetized in different directions are alternately arranged in a radial direction of the substrate, is used, comprising:
A method for recording and reproducing for an information recording disk-shaped medium, in which the information recording medium comprises a substrate with a magnetic recording layer disposed thereon for magnetically recording information, the magnetic recording layer being in advance magnetized concentrically or spirally around a center of the substrate for tracking and being disposed in such a manner that magnetized regions magnetized in different directions are alternately arranged in a radial direction of the substrate, and discrete servo fields being in advance magnetically recorded in the magnetic recording layer, is used, comprising:
A method for recording and reproducing for an information recording disk-shaped medium, in which the information recording medium comprises a substrate with a magnetic recording layer disposed thereon for magnetically recording information, the magnetic recording layer being in advance magnetized concentrically or spirally around a center of the substrate for tracking and being disposed in such a maimer that magnetized regions magnetized in different directions are alternately arranged in a radial direction of the substrate, and the magnetized regions being each formed so as to meander at a fixed frequency, is used, comprising:
A method of manufacturing an information recording disk-shaped medium, the information recording medium comprising a substrate with a magnetic recording layer disposed thereon for magnetically recording information, the magnetic recording layer being in advance magnetized concentrically or spirally around the center of the substrate for tracking such that magnetized regions magnetized in different directions are alternately arranged in a radial direction of the substrate, said method comprising the steps of:
Dependencies are inferred from the claim text.