Disc-shaped recording medium, manufacturing method thereof,...

Details Disc-shaped recording medium, manufacturing method thereof,... Disc-shaped recording medium, manufacturing method thereof,...

2007-06-19

2007-06-19

Neyzari, Ali (Department: 2627)

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

C369S013140

Reexamination Certificate

active

10486543

ABSTRACT:
A magneto-optical disk which reproduces information with an optical pickup head which uses an electromagnetic force as the driving force is provided. Other areas than at least the recording track are magnetized uniformly in a direction of canceling the influence of external magnetic field applied by the optical pickup head or a recording pattern having a frequency higher than modulation transfer function (MTF) of the optical pickup head is recorded to the other areas than at least the recording track. Read signals SP12and SP14from the magneto-optical disk are low in bit error rate.

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