As the manager of the data stored in the disk, the security of the file system is an important aspect of the operating system. Given the high logicalness and unambiguousness of the formal methods, also the module independence of the micro-kernel, this paper abstracts a formal model from the file system implementation based on micro-kernel, and then gives the axiomatic semantics of the initialization; finally, gives the correctness assertions of file system initialization, then verify the correctness of the formal model of file system aided with Isabelle/HOL.

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