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1.前言随着信息处理系统的发展,外存储装置显得愈来愈重要。所以,缩短存取时间,扩大存储容量,就成为提高外存储器性能的重要课题。要扩大存储容量,并提高记录密度,当然得研制高分辨率的记录介质和磁头,减小磁头和记录介质之间的间隙,以及提高定位精度等,而究竟采用哪一种记录方式则是充分利用记录系统本身特性来提高记录密度的一种重要途径。本文主要介绍改进型不旧“零”制MNRZI(Modifled-NRZI)。这种记录方式的特点是将4位信息变成5位来记录,和广泛使用的FM(调频制)、MFM(改进型调频制)方式比较,这
1. Introduction With the development of information processing systems, external storage devices become more and more important. Therefore, to shorten the access time, expand the storage capacity, has become an important issue to improve the performance of external memory. To expand the storage capacity and increase the recording density, it is of course necessary to develop high-resolution recording media and magnetic heads, to reduce the gap between the magnetic head and the recording medium, and to improve the positioning accuracy and the like, and which one of the recording methods is sufficient An important way to improve the recording density by using the characteristics of the recording system itself. This article describes the improved not old “zero” system MNRZI (Modifled-NRZI). The characteristic of this recording method is to record 4 bits of information into 5 bits, which is compared with the widely used FM (Frequency Modulation) and MFM (Modified Frequency Modulation) methods