Things I learned clearing disk space
shubhro.com
shubhro.com
There is WinDirStat (https://windirstat.info/) on Windows and quite a few similar tools on Linux such as Baobab, KDirStat, etc... (http://www.makeuseof.com/tag/how-to-analyze-your-disk-usage-...)
It's also incredibly fast if you are attempting to scan a folder you don't have access to ...
find / -xdev -type f -size +${2:-100}M -exec echo {} && du -h {} & \; ; }