Im having this problem with my dvds where they are about 150 smaller then they should be. They are advertized as 4.7gb disks so i was hoping id get to use 4.7 or 4.65 gigs for backup but for some reason all my burning software only alows to burn up to 4.55 gigs in size (and yes it dose make a huge difference cause im backing up anime and i cant get the last episode in a lot of the time)