How full is it? Can you show screenshot form Disk Management?
Check disk usage with Resource Monitor. Open Resource Monitor - disk tab - Disk Activity section. Check processes with most reads/writes (can sort by column total). To check file being read/written expand File column. Post screenshot. (upload to imgur.com and post link)
It would look similar to this:
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my c deive is 50% empty
my secondary hdd scores arpund 200 mb/s in read and writes
Disk activity is only 1% in that screenshot.
You have Tencent Gaming Buddy installed. It causes some disk writes. Do you need that software?