硬盘和软盘相对于主机(微处理器和内存储器组成)来讲都称外存储器或称辅助存储器。内存储器是主机的组成部分,也称主存储器。当微处理器进行运算时首先要取数据,运算结果的数据要储存,然后再做下一步的运算。快速的运算就要快速地取出和存入数据,如果这些数据向硬盘存取,它的存取速度太慢,微处理器大部分时间要停下来等待,电脑能快速进行各项工作的优越性 Hard disk and floppy disk relative to the host (microprocessor and internal memory components) are generally referred to as external memory or secondary storage. The internal memory is an integral part of the host, also called main memory. When the microprocessor to operate the first data to take, the results of the data to be stored, and then do the next operation. Fast computing should quickly remove and store data, if the data to the hard disk access, it’s access speed is too slow, the microprocessor most of the time to stop and wait, the computer can quickly carry out the work of the superiority