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磁盘驱动设备是计算机系统的最重要的外设。键盘及显示屏幕是常用的输入及输出设备。打印机及调制解调器扩展了系统的能力。计算机可用磁盘驱动设备存贮和检索大量信息。 计算机使用RAM存贮器临时存放用户程序及数据,甚至DOS都存贮在RAM中,并从RAM中调出来运行,大多数RAM存贮器都是易失性的。如果断开电源,则RAM中的任何信息均将会丢失。 而磁盘存贮器,则是不易失的,既使系统断电,在软盘上的信息仍然能保持住。这就是为什么磁盘如此重要的原因。
Disk drive devices are the most important peripherals of a computer system. Keyboard and display are common input and output devices. Printers and modems expand the system’s capabilities. Computer-usable disk drive devices store and retrieve large amounts of information. Computers use RAM memory to store user programs and data temporarily. Even DOS is stored in RAM and loaded from RAM to run. Most RAM memory is volatile. If you disconnect the power supply, any information in the RAM will be lost. The disk storage, it is not volatile, even if the system power, the information on the floppy disk can still be maintained. This is why disks are so important.