文件管理实验程序 把一个文件模拟为磁盘，然后在该磁盘上建立文件系统， 并提供基本的文件访问函数 作者：吕泽忠 最后修改时间：2005-4-13-document management experimental procedure, a simulation of the disk file, which is built on disk file system and provides basic file access functions Author : Lu:zezhong last modified caption-4-13
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