Help me to Finalize!

Hi everyone
I’m desparate for your help with my new Liteon DD A110 dvd recorder. It’s all working perfectly except when I come to finalize a disk I have recorded on to play it in other machines I get a message on the screen instructing me to CHANGE DISK. I can’t finalise anything! Can anyone advise where I might be going wrong?
I’d be grateful for any tips
Thanks

You might find better help if you go to the Liteon DVD Recorder forum at the bottom of the page you will see a drop down box named forum jump just scroll down until you see the forum and click on it