Same Problem and maybe a Solution?
I have the same problem as you do. I have ePSXe 1.7.0 (I have a topic on this with my specs and everything), and I was playing Digimon World at the time. I almost beat the game -- I used savestate and normal save, and everything was fine -- but then all of a sudden it asked to format my memory card! It has done this twice already. When you would save your game, did you close ePSXe correctly when you were done playing? (Press ESC -> File -> Exit) Did you use savestate too much? Apparently, I've been told that using savestate can cause this...but I have no official confirmation of that. Does anyone know if it's true, and if so is there a solution to this whole problem?