Fujitsu Corporation

Tomohisa Oyama

Hiroshi Uno

Yumiko Ohizumi

A disk control section of a disk apparatus comprises an identification section for identifying information regarding a position at which the head positioning servo information is stored, a position calculation unit for calculating the position on a disk medium where recording/reproduction of the record information is to be performed, a comparison and decision unit for comparing the information regarding the position identified by the identification unit with the position information calculated by the position calculation unit each time a predetermined command is received from the higher-level device, and for deciding whether or not the position identified by the identification unit is the position at which the record information is to be recorded on or reproduced, and a skip recording/reproduction unit for carrying out control such that when it is judged, on the basis of the result of the comparison made by the comparison and decision unit, that the position identified by the identification unit is the position at which recording/reproduction of the record information is to be performed, the record information is recorded/reproduced while skipping the position identified by the identification unit. Accordingly, it becomes possible to record and reproduce variable-length data even in a sector-servo type disk apparatus and a hybrid type disk apparatus, so that their storage capacities can be used effectively. In addition, recording and reproduction of data can be performed at high speed.

Disk apparatus, and recording/reproduction method therefor

A disk control section of a disk apparatus comprises an identification section for identifying information regarding a position at which head positioning servo information is stored. A position calculation unit calculates the position on a disk medium where recording/reproduction of record information is to be performed. A comparison and decision unit compares the information regarding the position identified by the identification unit with the position information calculated by the position calculation unit each time a predetermined command is received from a higher-level device, and for deciding whether or not the position identified by the identification unit is the position at which the record information is to be recorded on or reproduced. A skip recording/reproduction unit carries out control such that when it is judged, on the basis of the result of the comparison, that the position identified by the identification unit is the position at which recording/reproduction of the record information is to be performed, the record information is recorded/reproduced while skipping the position identified by the identification unit. Accordingly, it becomes possible to record and reproduce variable-length data even in a sector-servo type disk apparatus and a hybrid type disk apparatus, so that their storage capacities can be used effectively.

An array disk apparatus capable of identifying locations where data reconstruction has failed. The apparatus comprises a disk controller containing a data reconstructing unit, a 'reconstruction unsuccessful' information generating unit and a 'reconstruction unsuccessful' information storing unit. The data reconstructing unit reconstructs lost data based on the data from the magnetic disk units other than the failed and repaired unit and on parity data associated with the data. The 'reconstruction unsuccessful' information generating unit generates 'reconstruction unsuccessful' information if another magnetic disk unit develops a read error during a data reconstruction process. The 'reconstruction unsuccessful' data storing unit stores the 'reconstruction unsuccessful' information to the failed magnetic disk unit after the repair thereof.

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Kawasaki, Japan

Tomohisa Oyama