Question regarding dvd project duplication weird thing happen!

I made a dvd project from an avi with nero and i duplicate de dvd 20 time , it’s an invitation for an event thta i will send to people , if i look the source in explorer it’a a bout 40 mb and the destionation too but if i look physicaly on the dvd the source seem 3 time bigger than the destination why ?

i made the dvde at home and i duplicate the dvd with a dvd burner robot for the 20 dvd

and the weird thing is all of them are playing great

any hints


Well, I believe the DVD standards say there must be at least 1GB of data on a disc, so it might be padding it out to make it a valid DVD. Nero has this option checked by default.