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US 6,339,571 B1Granted
Storage medium recorded with recording/reproducing conditions depending upon recording densities and method of recording and reproducing therefor
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A table having a plurality of recording densities and a plurality of recording/reproducing conditions corresponding to the recording densities and each necessary for recording/reproducing a signal at a corresponding recording density is recorded in a TOC region of a magneto-optical disk. A recording/reproducing apparatus finds out a recording density at which it can record/reproduce data from the table and records or reproduces a signal at the recording density. The recording/reproducing conditions include the wavelength of a semiconductor laser, whether or not to employ the optical pulse magnetic field modulation recording method, the presence/absence of an optical super resolution pickup, whether or not to employ the optical pulse reproducing method, whether or not to employ the PRML method and the like. Therefore, if the recording/reproducing technology further advances, a signal may be recorded/reproduced to/from the magneto-optical disk at an optimum recording density without having to change the data format of the magneto-optical disk.
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