Method for controlling the farm of a magnetic domain of a magneto-optical disk using pre-write testing

An optical recording control method comprising the steps of:

• recording a predetermined recording pattern on a magneto-optical recording disk by a predetermined recording pulse before recording user data on said disk;
• obtaining a reproduced signal based on said recording pattern thus recorded from said disk;
• detecting an edge shift amount of a recording mark between said reproduced signal and said recording pattern;
• correcting said predetermined recording pulse by changing an energy level of said predetermined recording pulse in accordance with said edge shift amount;
• and
• recording said user data by said corrected recording pulse;
• wherein at least a plurality of recording marks are recorded on said disk by said recording pattern, said plurality of recording marks are reproduced, and said recording pulse is corrected on the basis of a reproduced signal indicative of a length of said recording mark.

An optical recording control method comprising the steps of:

• recording a predetermined recording pattern on a magneto-optical recording disk by a predetermined recording pulse before recording user data on said disk;
• obtaining a reproduced signal based on said recording pattern thus recorded from said disk;
• detecting an edge shift amount of a recording mark between said reproduced signal and said recording pattern;
• correcting said predetermined recording pulse by changing an energy level of said predetermined recording pulse in accordance with said edge shift amount;
• and
• recording said user data by said corrected recording pulse;
• wherein a power level that constructs the energy level of said recording pulse is comprised of a fine pulse formed of at least three levels, and said three levels are a read-out level having an energy level sufficient for reproducing information, an intermediate level for previously heating a nearby-position at which information is recorded, and a recording level having a power level for recording information.

An optical recording control method for recording, reproducing or erasing information onto or from a magneto-optical recording disk by using at least an externally applied magnetic field and a laser light, comprising the steps of:

• recording a test pattern on said magneto-optical disk;
• reproducing said test pattern from said magneto-optical disk;
• evaluating output waveforms of said reproduced test pattern;
• and
• recording data to be recorded onto said magneto-optical disk;
• wherein said laser light is irradiated as light pulses having different power levels of a first level for recording, a second level for pre-heating and a third level for reproducing, said step of recording data to be recorded being performed by changing said power levels while keeping a ratio of said first and second power levels at a constant value on the basis of results obtained in said step of evaluating output waveforms of said reproduced test pattern.

A recording control method for recording, reproducing or erasing information onto or from a magneto-optical recording disk by using a laser beam and an externally applied magnetic field, comprising the steps of:

• recording a predetermined recording pattern on said magneto-optical disk by applying a predetermined recording pulse before recording user data on said magneto-optical disk;
• obtaining a reproduced signal based on said recording pattern recorded from said magneto-optical disk;
• determining an ambient temperature and at least one characteristic of said magneto-optical disk on the basis of said reproduced signal;
• and
• recording information by using a recording pulse of said laser beam whose power level is controlled in response to the determined results of the ambient temperature and at least one characteristic of said magneto-optical disk;
• wherein said recording pulse is formed of at least four power levels of said laser beam, said four power levels being formed of a read-out level, an intermediate level, a first recording level and a second recording level, and a ratio between said intermediate level and a plurality of recording levels being set within a constant range.