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The USN Journal (Update Sequence Number Journal), or Change Journal, is a feature of NTFS which maintains a record of changes made to the volume.It is not to be confused with the journal used for the NTFS file system journaling.


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The United States Navy (USN) is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States.The U.S. Navy is the largest and most capable navy in the world, with the highest combined battle fleet tonnage.