Hi,
I'm sorry I don't have advice for your problem. If you insert the unrecognized media MacOS should ask you if you want to reinitialize it.
I have been using my DVD-RAM for some months now for backup. I initialized four sides using HFS+. While it works pretty much as expected (it's great to have that much backup space), I often get corrupted volumes. So far Disk First Aid has always fixed them but I've had a small number of lost files (which I had other backups for).
So in practice, I've had to run Disk First Aid before and after using DVD-RAM write sessions. This has solved my problems but it seems something isn't right. I'll try UDF and see if I have more reliable performance.