一、前言磁盘机作为计算机的外围设备,已经得到了广泛的应用。磁盘机的存贮容量、数据传输率及工作可靠性等各项指标,均有了很大提高。所以,无论大、中、小型计算机和微型机中,都少不了把磁盘机作外存用。根据结构的不同,磁盘机可分为硬盘和软盘机两类,如表1所列:目前,软盘机的容量一般为(256～512)千字节(一个字节为八位二进制位),常用在微 First, the preface Disk machine as a computer peripherals, has been widely used. Disk drive storage capacity, data transfer rates and reliability and other indicators have been greatly improved. Therefore, regardless of large, medium and small computers and microcomputers, ultimately, the disk drive for external use. According to the different structure, the disk drive can be divided into two types of hard disk and floppy disk machine, as listed in Table 1: Currently, the capacity of the floppy disk drive is generally (256 ~ 512) kilobytes (one byte is eight binary bits) Commonly used in micro