High Quality Content by WIKIPEDIA articles! USN Journal (shorthand form of Update Sequence Number Journal, also known as Change Journal) is a function of recording the changes on NTFS volumes. When Windows 2000 was released, Microsoft created NTFS version 3.0, which included several new features and improvements over older versions of the file system. One of these was a new system management feature that is very useful for certain types of applications. Under Windows 2000, NTFS 3.0 partitions can be set to keep track of changes to files and directories on the volume, providing a record of when and what was done to the various objects. When enabled, the system records all changes made to the volume in the USN Journal, which is the name also used to describe the feature itself.

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