Blue ray been around for some time. And at first people did switch to much they had a DVD player. and own many DVD over time as tv changed and people add surround sound sound bars even a shaking thing for the couch. people stared buying blue ray more. as the old DVD player stop being MFG even throw was DVDHD trying keep the format alive. Blue ray gives good sound and video. So people still own blue rays. but not buying a lot of disk DVD or blue ray. Not uncommon for movie be on both. with digital. over the internet. So know buying the movies you get 3 copy of the movie. One for cellphone or tablet and two being able to play on tv. And many movies are 3 deferent movies with a 4 disk with special video images sounds even games. trying make the movie more where streaming devices. Are taking over making tv smart. Samsung , LG, Don’t hide sailing blue rays and tv. What I did think about Intel few minutes is this could be asking the size of the disk. it the same size as dvd or cd if put a DVD or blue ray or CD in the drive slot it will run it . blue ray doesn’t care what the media is. where a DVD player could run a blue ray. but cd would still work.