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Data Domain SISL technology includes a combination of approaches that solve these problems. First, it identifies 99 percent of the duplicate segments in RAM, inline, before storing to disk. Second, it stores related segments and fingerprints together, so large groups can be read at once. With these techniques, Data Domain can utilize the full capacity of large SATA disks for data protection and, without increasing RAM, minimize the number of disks needed to deliver high throughput. In the long term, SISL allows DD OS-based system performance to track dramatic CPU speed improvements.