Hi,

I hope someone can shed some light on a problem I'm having. I hope this is not too obscure.

The setup:
- Recorded three episodes on a DVD-RW VR mode disc with a Sony RDR-GX7.
- Edited the original (A-B erase) to remove the commercials on two of the episodes.
- Took the disk to my PC with a Plextor DVD drive and used DMF3DC to extract the two episodes to a project. All is ok.
- Later put the disk back in my PC and the drive would not come ready for a long time. I was eventually able to read the disk.
- Put the DVD back in the Sony to edit the commercials, but then when I tried to go to the A-B erase function, the recorder said 'Operation not allowed on this disk.'

Now I could not do any edits on this disk, including editing the titles.

Question: Any ideas on what happened to the disk? Did something on my pc 'finalize' or alter the disk in some way? Any clues on what to look for?