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前言塑料盘作为输入装置已实用达数年之久。使用表明,它具有相当高的可靠性,目前已用作外存储器。因为塑料盘价格低廉,并具有随机取数功能,故已广泛用于台式计算机、灵巧终端设备、微处理机、小型计算机等方面。因而,迫切要求产品扩大存储容量。目前的塑料盘正以此为目标提高其性能。表1为 IBM 公司在这方面的发展动向:1.从磁盘单面记录到双面记录(1976年4月);2.从单密度到倍密度(1977年4月)。存储容量增加到2～4倍,即从250千字节/盘,
Introduction Plastic trays have been used as input devices for several years. Use shows that it has a very high reliability and is currently used as external memory. Because of the low price of plastic disk, and has a random access function, it has been widely used in desktop computers, smart terminals, microprocessors, small computers and so on. Therefore, it is urgent to expand the storage capacity of products. The current plastic plate is being targeted to improve its performance. Table 1 shows IBM’s developments in this area: 1. Single-sided recording from disk to double-sided recording (April 1976); 2. Single density to double density (April 1977). Storage capacity increased to 2 to 4 times, from 250 kilobytes / disk,