Patent ID: 6266299
Filing Date: 2001-07-24
Classification: G06T,G11B

Abstract:
An optical disk comprising:a disk substrate; anda recording layer on the disk substrate, the recording layer including a magnetic film with magnetic anisotropy in a direction perpendicular to a surface of the magnetic film;whereinthe optical disk stores write-once information, the write-once information being unique for the disk, formed by first recording areas and second recording areas in a pre-determined portion of said recording layer;a magnetic anisotropy in a direction perpendicular to a surface of the second recording areas is smaller than a magnetic anisotropy in a direction perpendicular to a surface of the first recording areas;the second recording areas are formed as stripe-shaped marks that are oblong in a radial direction of the disk; anda plurality of the stripe-shaped marks is arranged in a circumferential direction of the disk, the arrangement being based on a modulation signal of the write-once information.