constantinos

Hi everybody I am trying to burn a cd/dvd leaving FREE space ,but after this burning i want to add some more music/files. Every time i get the notification that the cd/dvd needs erasing,when the disc i am using is a rewritable,if the disc is not rewritable i just CANNOT add anything later! Even the simplest burning software has this option but i cannot find it here at IMGBURN. THANK YOU!