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The ever-increasing volume of archival data that needs to be reliably retained for long periods of time and the decreasing costs of disk storage, memory, and processing have motivated the design of low-cost, high-efficiency disk-based storage systems. However, managed disk storage is still expensive. To further lower the cost, redundancy can be eliminated with the use of interfile and intrafile data compression. However, it is not clear what the optimal strategy for compressing data is, given the diverse collections of data.
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