文件系统操作，能Crate，Delete目录，使用多级目录，至于是否采用索引节点结构，自选。目录项目中应包含：文件名、物理地址、长度等信息。-file system operation, can Crate, Delete Contents, the use of multi-level directory, As to whether Index node structure, Customize. Contents Item should include : name, physical a