This was a choice by Sony as nearly all commercial drive have both. Usually DVD and CD optic are combined as one unit as well. Do combination BD/DVD optic exist? Otherwise I do not understand a reason to not use a combined CD/DVD unit.
Red book CD-ROM audio does not require license to play, so I am not sure. Looking at a photo of the assembly it looks like there are one lens on some unit and two lens on other, so it must be a BD/DVD combination unit from some supplier and separate from other.
This was a choice by Sony as nearly all commercial drive have both. Usually DVD and CD optic are combined as one unit as well. Do combination BD/DVD optic exist? Otherwise I do not understand a reason to not use a combined CD/DVD unit.
All I know is the PS4 and PS5 can play DVD movies, but will reject audio CDs. Perhaps it's some kind of licensing issue.
Red book CD-ROM audio does not require license to play, so I am not sure. Looking at a photo of the assembly it looks like there are one lens on some unit and two lens on other, so it must be a BD/DVD combination unit from some supplier and separate from other.