Our old Sharp DV-RW250 has a DVR-R07 (same as A07 and 107 technically).
It reads DVD-ROM(video) DL, and writes DVD+RW and R, DVD-RW and R.
However, it does not even read recordable dual layer discs. Not +R DL and not -R DL.
Maybe, it attempts to read them as DVD-R instead of DVD-ROM.
I will have to try a DVD-ROM bitsetting.