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curriculum design an operating system, Simulation of UNIX (Linux) file system [Description of the issue] as an OS and built a large file, its facade into a disk, in which the realization of a simple simulation of the UNIX file system. [Basic requirements] 1. Hard existing machines opened 20 M disk space, as a set of hard drive space. 2. Prepared a management procedures this space management, to simulate the UNIX (Linux) file system, specific requirements are as follows : (1) require a disk block size k formal document (2) i node directory file type (a total of 1byte) block device Pipeline documents. Physical Address (Index) on a total of 13 tables, every item in Table 2 byte. 4byte document length. 1byte link count (3) 0, super-block length of 50 block Stack spare disk block management : G