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磁盘装置的早期产品在1956年开始用于计算机系统。第一台是IBM RAMAC磁盘机。它的容量为5兆字节,记录密度为2000位/6.25厘米~2,由50个盘径为600毫米的盘片组成,平均取数时间是0.6秒。磁盘机之所以能够发展的原因是:①由于第三代计算机IBM 360的出现,使数据处理的范围迅速扩大;②由于研制了可换式磁
Earlier products for disk devices began to be used in computer systems in 1956. The first is an IBM RAMAC disk drive. It has a capacity of 5 megabytes and a recording density of 2000 bits per 6.25 centimeters to 2 disks. It consists of 50 discs of 600 mm in diameter with an average acquisition time of 0.6 seconds. The reason why the disk drive is able to develop is that: ① the scope of data processing is rapidly expanded due to the appearance of the third generation computer IBM 360; ② due to the development of exchangeable magnetic