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A.In memory to open up a virtual disk space, file storage, file system on more than one user directory.
Two. Document physical structure can be explicitly links or other methods.
3. Disk free space management selectable bit diagram or other means. If you use the diagram to manage file storage space, and explicitly links allocation, the bit to show maps of the FAT.
4. The file directory structure using the multi-user multi-level directory structure, each directory entry contains the file name, physical address, the length of the file read and write protection, but also through the directory entry. Directory organization can not use the index nodes of the way, but using an index node, then the difficulty factor of 1.2.
5 Design a practical user interface, user-friendly. Request the relevant documents of the following:
(1) login (user login)
(2) The system is initialized (build file volume to provide the login module)
(3) file creati