I was not burning DL media, I was trying burning a film of around 4 GB size more like SL media, but when I tried to burn it, I was getting a warning notice from IMGBurn, informing me that my file size was to high, for my Disc capacity.
Problem solved now anyway,because I had other folders on my desktop, IMGBurn was calculating the data from them to, given the reason for the high file size calculation.
Thanks.