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Recent studies show disks fail much more often in real systems than specified in their data-sheets and RAID-5 may not be able to provide needed reliability for practical systems. It is desirable to have disk arrays and clustered storage systems with higher data redundancy, such as RAID-6. Meanwhile, latest research also indicates disk sector failures occur much more often than whole disk failures. It is hence important to study efficient disk sector failure recovery schemes for RAID-6.
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