The reading of input data streams and the writing of output data streams on auxiliary storage devices, concurrently with job execution, in a format convenient for later processing or output operations.

• 以一种便于以后处理或输出操作的格式,在执行作业的同时,从辅助存储设备上读入数据流,或向辅助存储设备上面写入输出数据流。