If you need to view a detailed log of Defraggler's activities for troubleshooting then you can run the software in debug mode.
When you chose to run Defraggler in debug mode it creates a log file, where information with different priorities will be listed. The number of messages in the list depends on the choice of a debug mode level. Available levels are as follow:
/debug - generates a log of Defraggler’s operations
/debug2 - generates a log of Defraggler’s operations, prints warnings and non-critical errors
/debug3 - generates a log of Defraggler’s operations, prints warnings, non-critical errors and more information. This mode is usually used as developer’s mode.
To run Defraggler in debug mode:
Defraggler also comes with a command-line version, which you can use to get more detailed debugging information. See this topic for more information.