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Magneto-optical disk having write-once identification marks and method for recording thereof

  • US 6,266,299 B1
  • Filed: 05/20/1999
  • Issued: 07/24/2001
  • Est. Priority Date: 12/19/1996
  • Status: Expired due to Term
First Claim
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1. An optical disk comprising:

  • a disk substrate; and

    a 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;

    wherein the 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; and

    a 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.

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