mcfs

I've got already MX4SIO, yet without the case, so still, it waiting for it's great moment. But meanwhile I read about it and peoples says that MX4SIO hang OSDSYS/HDD OSD. I don't know if those freezing/crashing problems comes from fs parsing which failing of course as it is unknown to them, or...

Does anyone have detailed specification of mcfs? I hear that there is a way to make "save" protected from been deleted, is this true? Because I assumed it is somewhere in file attributes, but where? @TnA made some tests and none of them making the save impossible to delete from OSDSYS...