| 摘要 |
The vulnerable interval between the occurrence of a localized or spot failure and the occurrence of a detectable disk failure is reduced by providing redundancy within a single disk. Sectors of the disk may be grouped into independent sets. Error-correcting or erasure-correcting codes may be applied across groups of sectors where the maximum number of failures prior to detectable disk failure is expected to be small. It is desirable to place all sectors in adjacent tracks in different redundancy groups. This provides a lower bound on the number of redundancy groups needed.
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