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Optical disk, method for recording and reproducing write-once information on and from optical disk, optical disk reproducing device, optical disk recording and reproducing device, device for recording write-once information on optical disk, and optical disk recording device

  • US 20010021144A1
  • Filed: 04/12/2001
  • Published: 09/13/2001
  • Est. Priority Date: 12/19/1996
  • Status: Active Grant
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 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 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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