how do i make a backup copy of GT4 ?

[s12original]

First i have to be honest with you . I don't have a PS2 and the Gran Tourismo 4 is a game that my younger brother has purchased and asked me to make a copy for him ( he owns a PS2 ).I don't realy have experiance copying PS2 games so when i tried to copy GT4 i run onto the following problem : I use the Alcohol 120 to make copies, so i used it to make an image of GT4 .The problem is that when i try to write the image to the disk alcohol 120 can't do that because i have single layer DVD redorder and so i use 4.7Gb disks. When i open the original GT4 disk with windows explorer (right clic on it and select properties) it shows total amount of data 3.09 GB .When i do the same with the image that Alcohol 120 had prodused from the original DVD i get total amound of data 5.27 GB . How do i copy this game on a 4.7 GB disc ? Please help . Any answer will be appreciated . Please try to include as many details as possible .