Any access method that synchronizes the transfer of data between the computer program using the access method and input/output devices, thereby minimizing delays for input/output operations.; 某種存取方法，它可以讓使用這種存取方法的計(jì)算機(jī)程序和輸入輸出設(shè)備之間的數(shù)據(jù) 傳送得到同步，從而可以把因輸入輸出操作而產(chǎn)生的時(shí)間延遲降到最小范圍。