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In a journaling file system -- such as ext3 or NTFS -- changes are written to a separate log - the journal - before being committed to the main storage area. This journal contains information about the intended changes.

In the event of power failure or system crash tools can compare the journal to the main file system and discover inconsistencies without walking the entire file system.

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It recovers the change in the file so you can reindex. That's what I came up with.


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