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The Terabyte Track explores how adhoc retrieval and evaluation techniques can scale to terabyte-sized collections. For TREC 2004, our first year, 50 new adhoc topics were created and evaluated over aa 426GB collection of 25 million documents taken from the. gov Web domain. A total of 70 runs were submitted by 17 groups. Along with the top documents, each group reported average query times, indexing times, index sizes, and hardware and software characteristics for their systems.