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激光盘只读存贮系统(CD-ROM)使信息有了一种新型的存贮、传播方式,它使用高密度的信息存贮介质——激光盘。激光盘用反光材料夹在塑料盘基中制成,它采取数字化的存贮方式,每张激光盘至少可以存贮550兆字节的信息,相当于1500张微计算机用的5英寸普通磁盘的存贮量,或相当于15万张印刷页的文字内容。激光盘系统自从1985年开始应用于图书情报机构以来到现在已有了迅速的发展。目前在美国已有了一整套的激光盘系统的市场服务,以满足用户的要求,同时由于激光盘系统具有存贮量大、检索快捷的优势,不少图书情报机
CD-ROM makes information has a new type of storage, transmission, it uses high-density information storage media - laser disc. Laser disc with reflective material sandwiched between the plastic disc base, which adopts digital storage, each laser disc can store at least 550 megabytes of information, equivalent to 1,500 micro-computer with 5-inch ordinary disk Storage capacity, or equivalent to 150,000 pages printed text content. The laser disc system has been rapidly developed since its introduction in Library and Information Service in 1985. Currently in the United States has a complete set of laser disc system market services to meet user requirements, at the same time as the laser disc system has a large storage capacity, the advantages of quick retrieval, many library information machines