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Latent sector errors in disk drives affect only a few data sectors. They occur silently and are detected only when the affected area is accessed again. Ifa latent error is detected while the storage system is operating under reduced redundancy, i.e., during a RAID rebuild, then data loss may occur. Various features such as scrubbing and intra-disk data redundancy are proposed to detect and/or recoverfrom latent errors and avoid data loss. While such features enhance data availability in the storage system, their execution may cause performance degradation.
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