Disk write error recovery system
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorAkira Endo
Life of this patent
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Abstract
A disk write error recovery system including an alternate sector part previously specified for rewriting of the associated data upon any write error produced, the alternate sector part being rewritten when any error is produced and having its header part marked with a used mark, for the purpose of recovery of such a write error.
Claims6
A disk write error recovery system including a disk having a first sector and a second sector, each comprising a header part and a data part, the recovery system functioning such that when any write error is found in writing data in a first data part in said first sector the data is rewritten in a second data part in said second sector instead of writing that data in said first data part, wherein, said second sector is preassigned to said first sector in a first header part in said first sector specifying said second sector for rewriting upon any write error being found in the disk itself, said second sector including a second header part in which said second is marked with a mark indicating that said second sector has already been used for recovering a write error.
A method of recovering write errors on the surface of a disk which includes a sector part composed of a header part and a data part, the method comprising the steps of:
- marking the header part of a first sector part with an error flag indicating that a write error has occurred previously in writing to the sector part;
- preassigning in the first sector part an alternate sector to the first sector part;
- determining whether the first sector part has been marked with the error flag;
- and
- writing the data designated for the first sector part to the preassigned alternate sector part when the first sector part has been marked with the error flag.
A method of recovering write errors on the surface of a disk which includes a first sector and other sectors, each composed of a header part and a data part, the method comprising the steps of:
- preassigning in the disk an alternate sector for the first sector by designating said alternate sector with a mark in a first header part in the first sector;
- writing data designated for the first sector in a second data part in said alternate sector upon any write error being found in writing data in said first data part;
- and
- marking a second header part in said alternate sector when writing the data in said alternate sector with a used flag indicating the particular other sector being used as said alternate sector.
Dependencies are inferred from the claim text.