I have a CD that I would like to generate a BIN file from (with a CUE file to accompany it). I used ImgBurn and UltraISO to to generate two BIN files. However, I have found out that BIN files generated by these programs are not identical (different file size). So, what is the difference between the BIN file formats and which one should I use to backup CD? The same applies to ISO file generation by these two programs - file size does not match.