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3、电子文件载体的非直读性。电子文件的非直读性体现在很多方面。一是数字编码记录于载体上肉眼无法分辨,何况磁载体上的“磁畴”极性是物质内部的物理性质,根本不可能看到。此外载体上的信息记录密度极大,例如一张容量可达600MB-4000MB的光盘,刻写激光斑点的直径小于百万分之一毫米,可存35万张打印纸上的文字信息,或10万页图形信息。即使在高倍显微镜下可以看见光盘上的记录痕迹,也不可能读懂那些小点表示什么。另外,载体上的数字信
3, non-direct reading of electronic document carrier. The non-direct reading of electronic documents is reflected in many ways. First, the digital code recorded on the carrier naked eye can not tell, not to mention the magnetic carrier “magnetic domain ” polarity is the physical properties of the material, it is impossible to see. In addition, the information carrier density is very large, for example, a capacity of up to 600MB-4000MB CD-ROM, writing laser spot diameter less than one millionth of a millimeter, can save 350,000 text messages on printing paper, or 100,000 Page graphic information. It is impossible to understand what those dots represent even though the traces on the disc can be seen under a high magnification microscope. In addition, the digital letter on the carrier