How do I defragment “C:\$Extend\$UsnJrnl:$J:$DATA”?

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This huge file is used by Windows to track changes in other files and cannot be defragmented. You can delete it by entering the following on the Run commandline (Windows 2003/XP/Vista, not Windows 2000), it can take several minutes to finish:

fsutil usn deletejournal /n c:


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