Method for recording signal on recording medium and method for reproducing signal on recording medium

Abstract

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, aperture value of objective, 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.

Description

technical field [0001] The present invention relates to recording media such as disks, tapes, drums and recording and reproducing methods thereof, more particularly to a magneto-optical disk and recording and reproducing methods thereof. Background technique [0002] Now, various recording media such as high-density discs, mini discs, digital video discs, video tapes and the like are available. The data format and recording capacity of various recording media are determined by Japanese Industrial Standards. However, recent advances in recording / reproducing technology and advances in technologies of various main components such as pickups have made it possible to greatly increase the recording capacity. [0003] In this way, when the recording capacity may be increased due to rapid technical progress, the standard of the recording medium will be changed, so it is difficult to ensure compatibility between recording / reproducing apparatuses for the recording medium. However, i...

AI Technical Summary

Problems solved by technology

However, recent advances in recording / reproducing technology and advances in various main element technologies such as pickups have made it possible to greatly increase the recording capacity

[0003] In this way, when the rapid progress of technology may increase the recording capacity, since the standard of the recording medium will be changed, it is difficult to ensure the compatibility between the recording / reproducing devices of the recording medium.

However, if the compatibility is abandoned, there will be a problem that the playback device using the new standard cannot reproduce the signal of the recording medium using the old standard, which is very inconvenient for the user.

On the other hand, if the interchangeability is ensured, there will be a problem that the cost of the recording / reproducing device increases

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