Before exiting the burn cycle, you should pay attention. It should ask if you want to "finalize" the disc. You don't want to do that, instead leave it open or have an open session or similar wording. That way, provided you don't finalize the burn session, you return to the DVD and continue burning other video or media to it until it fills up. If the setting or configuration is prior to the burn session, then again make sure you don't finalize it.
I have a 72 mb video clip and a 5 GB DVD-RW and use Everio Media Browser for my JVC camcorder-the 72 mb video takes up all the space on the 5 GB disk-why? Is there some setting on the pc or the Everio software?