I was just guessing that you have slightly over 700mb .bin image that you want to burn on cd. Bin images up to 800mb will fit on 700mb cd. In that thread, you find discussion about creating .cue file you can use to burn that image and so on... If you are trying to split that .bin image into smaller parts, then you might want to use winrar or some other compression software to pack it in two or more parts.