Diskeeper reported that the \$Extend\$UsnJrnl [Excluded] file size of 872 GB on a 10 GB partition. Diskeeper helpdesk identified problems with OS upgrades regarding \$Extend\$UsnJrnl, however could not address the file size anomaly. Ticket closed. After a little research, I discovered a native command line utility called Fsutil. After executing this utility the problem is resolved.
Note: Do not perform this process on a domain controller.
Screenshots of the original curiosity. Note the extensive, Green – system files.
Those Green – system files is \$Extend\$UsnJrnl and the File size reported exceeds the actual partition size of 10 GB.
Note the Fragmentation percentage is out of range.
From the CMD prompt, Fsutil USN DeleteJournal /D C:
When complete, if the Indexing Service was running.
Stop and Start the Indexing Service.
Note that the CI is the Indexing Service. The stop error is a result of the non existent journal. When restarted, the Index rebuilds correctly.
Now note the far fewer system files in Green.
The more expected percentage.