Fujitsu Corporation

Shinya Kobayashi

Shigenori Yanagi

Masaaki Iwasaki

Teruji Yamakawa

Kiyomi Imamura

Hideshi Mochizuki

A write retry processing unit repeats a write retry operation of a write and a verify, while performing a setting change of a focus offset for recording a data on an optical storage medium in case a verify error occurs in executing the write and a verify try fails. A learning processing unit retains a sum total of the number of adding times of the successful focus offset and the number of subtracting times of the successful retry offset as a learning result at the successful time of the write retry, and a write condition changing unit changes the focus offset setting value of the default so as to be drawn near to the latest focus offset which succeeds in the retry when the absolute value of the learning result retained in the learning processing unit is equal to or more than a threshold value.

Optical storage device, recording method of optical storage medium and program

If regeneration is not performed normally when data is regenerated from a medium, a read retry processing unit changes the intensities of the laser beam and of the regeneration magnetic field respectively to prearranged stages to perform the regeneration again. A regeneration condition change unit remembers the regeneration sector number for one read command from the higher order. When retry occurs, the regeneration condition change unit counts the number of the sectors for each stage which can be regenerated at each stage, and by providing a coefficient for each stage in advance, changes the default regeneration condition using the sum of products of the coefficients and the number of the counted regenerable sectors.

Optical storage apparatus, method for regeneration from optical storage medium, and method for recording on optical storage medium

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.

Optical storing apparatus and reproducing method for correcting read errors

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.

Magneto-optical information storage apparatus and information storage method with function of updating default value of applied magnetic field

There is disclosed an information storage apparatus with a low current consumption in a spindle motor or the like. A spindle motor driver and spindle motor serve as both a driver for driving a disk-like information storage medium in a predetermined direction and a brake for forcibly stopping rotation of the information storage medium, and by appropriately inputting, to the spindle motor driver , a spindle-on signal SPDLON for operating the spindle motor driver and spindle motor as the driver and a brake signal BRAKE for operation as the brake, MPU selectively uses a forced stop operation for stopping driving the information storage medium to forcibly stop the information storage medium, and a natural stop operation in which the spindle motor simply stops driving the information storage medium.

Information storage apparatus having selective storage medium rotation stop operation

A power save mode control method for a storage unit which is loadable with recording mediums, having different formats, includes the steps of detecting whether or not a format of a recording medium loaded into the storage unit is a first format which is preset, and setting a clock frequency of a clock within the storage unit to a first frequency with respect to the recording medium having the first format when changing a mode of the storage unit to a power save mode if the loaded recording medium has the first format.

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Kawasaki, Japan

Shinya Kobayashi