Some players won't play BD-Rs and as I have used BD-Rs to save personal data backups, I can say I have been able to get rid of the -R part by soaking them in soapy water for a few days, leaving only the plastic base and a blue liquid left. But that was intentional ....
A quick check of the Flicker Alley Blu-Rays I have quick access to indicates that the MD code means they are BD-R (eg Valentino Vol 1)
FA + a number (Cinerama titles) are pressed ...