Magneto-optical information storage apparatus and information storage method with function of updating default value of applied magnetic field
AssigneeFujitsu Limited
InventorsShinya Kobayashi, Shigenori Yanagi
Life of this patent
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Abstract
The present invention provides an information storage apparatus which at least records information by applying a magnetic field to a recording medium with a smaller power consumption. A default value of a recording magnetic field is set to a minimum value of the apparatus. Through a learning process, the default value of the recording magnetic field is changed to a value in the vicinity of the minimum value.
Claims17
An information storage apparatus which carries out a recording to record information on a recording medium magneto-optically by applying a recording magnetic field to the recording medium, comprising:
- a magnetic field generating unit that applies a magnetic field to the recording medium;
- a magnetic control unit that specifies a control value for controlling a magnitude of the magnetic field generated by the magnetic field generating unit to a value within a control range of recording magnetic field of the magnetic field generating unit;
- a storage unit that stores an initial value of the control value, said initial value being a minimum value of the control value within the control range, the minimum value being a value obtained in a nominal state;
- a detection unit that detects a write error during the recording;
- and
- an updating unit that updates the initial value to a new control value within the control range depending on the write error detected by said detection unit.
A method of magneto-optically carrying out a recording to record information on a recording medium in an information storage apparatus, comprising the steps of:
- applying a magnetic field from a magnetic field generating unit to the recording medium;
- detecting a write error during the recording;
- and
- updating an initial value of a control value for controlling a magnitude of the magnetic field within a control range of a recording magnetic field of the magnetic field generating unit to a new control value depending on the write error detected by said detecting step, said initial value being a minimum value of the control value within the control range, the minimum value being a value obtained in a nominal state.
An information storage apparatus which carries out an erasure to erase information from a recording medium magneto-optically by applying an erasing magnetic field to the recording medium, comprising:
- a magnetic field generating unit that applies a magnetic field to the recording medium;
- a magnetic control unit that specifies a control value for controlling a magnitude of the magnetic field generated by the magnetic field generating unit to a value within a control range of the erasing magnetic field of the magnetic field generating unit;
- a storage unit that stores an initial value of the control value, said initial value being a minimum value of the control value within the control range, the minimum value being a value obtained in a nominal state;
- a detection unit that detects an erase error during the erasure;
- and
- an updating unit that updates the initial value to a new control value within the control range depending on the erase error detected by said detection unit.
A method of magneto-optically carrying out an erasure to erase information from a recording medium in an information storage apparatus, comprising the steps of:
- applying a magnetic field from a magnetic field generating unit to the recording medium;
- detecting an erase error during the erasure;
- and
- updating an initial value of a control value for controlling a magnitude of the magnetic field within a control range of an erasing magnetic field of the magnetic field generating unit to a new control value depending on the erase error detected by said detecting step, said initial value being a minimum value of the control value within the control range, the minimum value being a value obtained in a nominal state.
An information storage apparatus which carries out a reproduction to reproduce information from a recording medium magneto-optically by applying a reproducing magnetic filed to the recording medium, comprising:
- a magnetic field generating unit that applies a magnetic field to the recording medium;
- a magnetic control unit that specifies a control value for controlling a magnitude of the magnetic field generated by the magnetic field generating unit to a value within a control range of the reproducing magnetic field of the magnetic field generating unit;
- a storage unit that stores an initial value of the control value, said initial value being a minimum value of the control value within the control range, the minimum value being a value obtained in a nominal state;
- a detection unit that detects a read error during the reproduction;
- and
- an updating unit that updates the initial value to a new control value within the control range depending on the read error detected by said detection unit.
A method of magneto-optically carrying out a reproduction to reproduce information from a recording medium in an information storage apparatus, comprising the steps of:
- applying a magnetic field from a magnetic field generating unit to the recording medium;
- detecting a read error during the reproduction;
- and
- updating an initial value of a control value for controlling a magnitude of the magnetic field within a control range of a reproducing magnetic field of the magnetic field generating unit to a new control value depending on the read error detected by said detecting step, said initial value being a minimum value of the control value within the control range, the minimum value being a value obtained in a nominal state.
Dependencies are inferred from the claim text.