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The Data Domain system derives its performance advantages from the EMC Data Domain Stream-Informed Segment Layout (SISL) scaling architecture. This CPU-centric approach minimizes the number of disk spindles required to achieve the throughput performance needed for critical single-stream operations. Data Domain system stores unique data sequence only once and save significant physical storage capacity by substituting small references for identical redundant sequence, enabling cost-efficient retention on disk for fast, reliable recoveries. Snapshot technology further enables extended local and off site retention on disk.