Then use the FSCTL_READ_USN_JOURNAL control code to read the journal records of interest. When you need information on a specific set of records, use the FSCTL_QUERY_USN_JOURNAL control code to obtain the change journal identifier. In either case, all existing USNs are less than any future USNs. When the NTFS file system stamps a journal with a new identifier rather than re-creating the journal, it does not reset the USN to zero but continues from the current USN. When an administrator deletes and re-creates the change journal, for example when the current USN value approaches the maximum possible USN value, the USN values begin again from zero. That is, you must be a member of the Administrators group. To perform this and all other change journal operations, you must have system administrator privileges. To obtain the identifier of the current change journal on a specified volume, use the FSCTL_QUERY_USN_JOURNAL control code. Such a move can happen in a dual-boot environment or when working with removable media.
.net usn journaling filewatcher update#
The file system stamps the journal with a new identifier where the existing update sequence number (USN) records either are or may be unusable.įor example, the NTFS file system restamps a change journal with a new identifier when a volume is moved from one version of NTFS to another and then back. The journal is stamped with this identifier when it is created. The NTFS file system associates an unsigned 64-bit identifier with each change journal.
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