引言——在数据处理系统中广泛采用磁带来存贮数字和字母信息。在这些系统中信息或者从磁带传送到处理机或者由处理机将信息记录在带的各个信息区上,这些区记录着与某事物有关的或与某基本单元有关的信息。信息长短不一,可记录50～5000个符号,所需带长为0.5～50吋。 对磁带装置的独特要求是,走带速度要快,使下一个信息区能迅速通过读、写头。另外也 Introduction - Tapes are widely used in data processing systems to store both numeric and alphanumeric information. In these systems information is either transferred from the tape to the processor or recorded by the processor on the various information areas of the tape which record information related to something or related to a basic unit. The length of the message varies from 50 to 5000 symbols, with a required length of 0.5 to 50 inches. The unique requirement for a tape drive is that the tape transport speed is fast, allowing the next information area to quickly pass through the read and write heads. In addition