TFS is a modular, fast, and feature rich next-gen file system, employing modern techniques for high performance, high space efficiency, and high scalability.
It was originally written for Redox OS but any system can use it.
Pro Full-disk compression
TFS is the first file system to incorporate complete full-disk compression
through a scheme we call RACC (random-access cluster compression). This
means that every cluster is compressed only affecting performance slightly.
It is estimated that you get 60-120% more usable space.