How do I defragment "C:\$Extend\$UsnJrnl:$J:$DATA"?
From MyDefrag
FAQ Special files - How do I defragment "C:\$Extend\$UsnJrnl:$J:$DATA"?
This huge system file cannot be defragmented. It can only be deleted, see the
the 
DeleteJournal command.
See also:
DeleteJournal Frequently Asked Questions