You won't need to mount the files if you are just burning the game. Mounting is used to just emulate the effect of putting a CD into the computer. You'll need to image burn the file and if you are using Alcohol, I believe there is a drop down menu that you can set the burning mode for a PSX game. I'm not 100% sure, I'd check it myself but I don't have Alco anymore. It bugged me; something to do with the StarWindService or something like that.