Use any file compressing tool for this. As suggested, winRAR can do this. Also WinZip and 7Zip can do it.
Just zip the 8 GB folder and select splits of 4GB. Use "No compression" method to have a fast operation. After that, burn the 4GB zip files on to DVDs.
oyaa compress karanna oona file eka uda ho folder eka uda right click karala Add To Archive yanna. ethakota enava me vage window ekak
ooken oyaata split venna ona size eka Split to volumes, bytes kiyana eken denna. anith deeval oyaa dannava athi man hithanne.
(habai oya right click karahama winrar commands denna puluvan venne install karaddi ho pasuva winrar programme eken ho Shell Integrations deela thibunoth thamai.)