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Define UFD and MFD.
In the two-level directory structure, every user has her own user file directory (UFD). Every UFD has a similar structure, but lists only the files of a one user. When a job starts the system's master file directory (MFD) is searched. The MFD is indexed by the user name or account number, and every entry points to the UFD for that user.
What is an acyclic graph? A tree that has been corrupted by links to other branches, but does not have any cyclic paths in it.
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is the operating system windows sometimes interupts
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