Optical storing apparatus and reproducing method for correcting read errors
AssigneeFujitsu Limited
InventorsShinya Kobayashi, Shigenori Yanagi, Teruji Yamakawa, Kiyomi Imamura
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Abstract
A read retry of an MSR medium is executed while changing a setting of a reproducing magnetic field. Parameter set values of a successful read retry are stored as statistic information. When changes of the set values for defaults increase, the defaults are updated. The parameter set information of a retry success is stored as statistic information. In a new read retry, the parameter set information of a high success ratio is selected from the statistic information and the retry is executed.
Claims20
An optical storing apparatus comprising:
- an optical storage medium in which at least a recording layer to record data and a reproducing layer to reproduce the data recorded on said recording layer are formed on a substrate;
- a reproducing unit for reproducing the data recorded on the recording layer of said optical storage medium at a recording mark smaller than a beam diameter of a laser beam by setting a combination of a reproducing magnetic field and a reproducing laser power which are necessary for the reproduction into optimum values;
- and
- a read retry processing unit for changing a value of said reproducing magnetic field and retrying a reproducing operation at the time of a read retry when a read error occurs in said reproducing unit.
An optical storing apparatus comprising:
- a reproducing unit for reproducing the data recorded on said optical storage medium by setting parameters necessary for reproduction to optimum values;
- and
- a retry processing unit for performing a read retry while changing the setting of said parameters at the time of a read retry when a read error occurs in said reproducing unit, storing parameter set values as statistic information at the time of a retry success, and updating optimum parameters by a learning process based on said statistic information.
An optical storing apparatus comprising:
- a reproducing unit for reproducing data recorded on an optical storage medium by setting parameters necessary for reproduction to optimum values;
- and
- a retry processing unit for performing a read retry of a high success ratio on the basis of past successful retry information at the time of a read retry when a read error occurs in said reproducing unit and storing successful retry information at the time of a retry success.
Dependencies are inferred from the claim text.