目前，小型专业图书馆中光盘数据库的检索主要是通过单机单光盘的方式进行的。如医院图书馆中常用的MEDLINE光盘数据库及中国生物医学文献光盘数据库（CB－MDISC），盘片有近三十张，每次检索大约需查5～10年的内容，这就至少需要频繁地换盘5～10次，效率极为低下，而且光驱易 At present, the retrieval of compact disc databases in small professional libraries is mainly carried out by means of a single single disc. Such as the hospital library commonly used MEDLINE CD-ROM database and the Chinese Biomedical Literature CD-ROM database (CB-MDISC), there are nearly 30 platters, each search about 5 to 10 years to check the content, which requires at least frequently Change plate 5 to 10 times, the efficiency is extremely low, but easy to drive