problem with the size of the image .

[fibola]

i hope im in the right place , i have a prob with an image i tring to made , im done many image till today but today was the first time that i get an image bigger then a dvd disc, the movie im tring to make a image is at the size of 4,642,123,776 bytes and what i get is 5,028,050,944 bytes , how can i fix it ? its the first time he was wrong, (im using ImgTools Ver. 0.89)