Optical disk and manufacturing method for the same

Details Optical disk and manufacturing method for the same Optical disk and manufacturing method for the same

2005-12-27

2005-12-27

Neyzari, Ali (Department: 2655)

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

C369S013420, C369S013550, C369S275400

Reexamination Certificate

active

06980490

ABSTRACT:
An optical disk is made of tracks that are magnetically separated from one another by scanning a focused light beam over lands between tracks at a predetermined power and annealing to lower the magnetic anisotropy of a magnetic layer on the lands, and is provided with a power testing region comprising one or more tracks for finding the predetermined annealing power at the location of at least one of the group consisting of a specific region within the data region, a region more to the inner side than the innermost track of the data region, and a region more to the outer side than the outermost track of the data region. Thus, an optical disk and a manufacturing method for the same can be provided that have a high recording density and with which annealing can be implemented in a short time and at the correct annealing width.

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