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OCR: `Siterprise backugye 5.25 inch (0) 12-inch Worst 1-1-inch WORMS Figure 1. The data storage model consists of three levels: online storage for data you need quickly and frequently, nearline storage for data that's refer- enced occasionally, and offline storage for creating historical data records. Optical storage technolo- gies fit best in the nearline and offline levels.