Windows 10 - C drive full but no files [duplicate]
Solution 1:
There are plenty of tools available to help diagnose lost disk space.
One such tool which I've used for many years (more than I care to mention) is TreeSize. They have a free version, which you can download from here.
Scan your C:\ drive, and order the results in descending order by size. If pagefile.sys or hiberfil.sys turn out to be the offending items, look at moving your pagefile off your SSD, or capping its size, and/or disable hibernation.
Alternative tools include but aren't limited to SpaceSniffer, windirstat, ...