Polyphase Sorting With Overlapped Rewind* A variation of the polyphase merge technique of sorting is described which permits one tape at a time to be rewound while the merge is continued on the remaining tapes. The result is the overlapping of a major portion of the rewind time. The technique should be considered whenever a sort is written to operate on five or more tapes that cannot be read backwards. The savings of the overlap method appear to increase as the number of available tapes is increased. CACM March, 1964 McAlester, R. L. CA640315 JB March 10, 1978 2:38 AM 1117 4 1117 1117 4 1117 1117 4 1117 2017 4 1117 2017 4 1117 2146 4 1117 2146 4 1117 677 4 1117 860 4 1117 861 4 1117 1117 5 1117 1117 5 1117 1117 5 1117 636 5 1117 862 5 1117 861 5 1117