Disk array with error type indication and selection of error correction method
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United States of America Patent
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Jun 15, 1993
Grant Date -
N/A
app pub date -
Jul 9, 1990
filing date -
Jul 9, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A data recovery channel for a fault tolerant data storage system. The data storage system includes a plurality of disk drives and an input interface formatting the data records for storage among the disk drives. Stored data is organized into sectors and rows of sectors, sectors including error correction codes for the sector, and rows including sectors of parity data for the sectors of the row. Upon readback, the data recovery channel preferentially operates on parity data for error correction over utilization of error syndromes generated from the error correction codes for error correction, though both remain available. Absent an indication that an error is contained in more than one sector for a row of sectors, correction of error in the defective sector is made by use of parity information. Where error is indicated for more than one sector in a row of sectors, correction using the error syndromes is attempted, sector by sector, until the number of sectors in the row having error is reduced to one. Parity is used to correct the remaining defective sector.
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