I've upgraded to win7 recently, so I had to also get nero 9. I've burnt at least 50 dvd's without realising this: under the "multisession" tab, I've had "no multisession" checked. But under "burn", "finalize disc (no further writing possible)" is unchecked. Since I have "no multisession" checked, are the discs finalized, or will I have to put them all in again, and finalize them?