Unfinalized DISCS worked with all my devices, even with MP3 Boombox JVC RC-EX30 from 2004.
The discs that do not work with all devices are the ones with open SESSIONS. I think that there is huge confusion in that case.
On DVD-R and CD-R, the DV-RW250 which has a DVR-R07 (DVR-107 for DVD recorders) indicates “DVD-R” and “CD-R”, if the inserted disc is unfinalized or blank. For finalized discs, it just indicates CD and DVD normally.