blocked records

blocked records

(storage)
Several records written as a contiguous block on magnetic tape so that they may be accessed in a single I/O operation. Blocking increases the amount of data that may be stored on a tape because there are fewer inter-block gaps. It requires that the tape drive or processor have a sufficiently large buffer to store the whole block.
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Input: Data set (records) D, keys k[] Output: Blocked records Var: n [left arrow] no.