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本文将扼要地介绍计算机外部设备目前的技术状况,着重介绍一般常用装置的种类及特性。磁带机磁带机是目前用作大容量数据存储器的重要输入输出装置。这些装置之所以普遍流行,有几个原因:除磁盘以外,磁带最接近于现代计算机的数据处理速度。它的存储密度很高,可以把大量的信息密集地存储起来。成本也较低并且使用经济(记录过的磁带可以清除掉再用很多次,制造厂家估计为20,000—50,000次)。磁带机可以完成输入及输出操作,其中有些装置正走和反走时都能进行读出。此外,磁带还可以用作计算机和其他外部设备之间的联
This article will briefly introduce the current state of the art of computer peripherals, highlighting the types and characteristics of commonly used devices. Tape drives Tape drives are an important input and output device currently used as high-capacity data storage. The reason why these devices are popular is that for several reasons: tapes are the closest to the modern computer’s data processing speed except disks. It has a high storage density and can store a large amount of information intensively. The cost is lower and economical (recorded tapes can be erased many times and the manufacturer estimates 20,000-50,000). The tape drive can perform both input and output operations, some of which can be read while walking and going backwards. In addition, the tape can be used as a connection between a computer and other external devices