You can use a PC with a DVD Writer to finalise the disk. Use either Nero or Sonic software, and there is an option to choose the 'track' you've recorded and add to it. Add just an empty text file, and choose 'finalise disk' when you burn this. Instead of putting just the little text file on the DVD, it'll add it to the end of the track you've already written, then finalise it, and your new DVD player will be able to see it.
It's not fast, as I think it has to read the whole track in first. But I did it on a DVD that I took to work that I'd forgotten to finalise, took about an hour for 2 hours of video, and I was able to play it in a standad DVD player. You may be able to do it with other software but I know Nero and Sonic both have the feature.
Chris, April 2007