由于允许对频繁使用的数据进行快速存取，软件运行要比从主存储器中存取数据快得多。
By allowing fast access to frequently used data, software can run much faster than if it had accessed the data from the main memory.
数据由快速存取存储器（磁盘）传送到存取速度较低的存储器（磁带）的过程。
The movement of data from fast-access storage ( magnetic disc ) to storage of lower access speed ( magnetic tape ).
数据由快速存取存储器（磁盘）传送到存取速度较低的存储器（磁带）的过程。
The movement of data from fast-access storage ( magnetic disc ) to storage of lower access speed ( magnetic tape ).
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