Question: are all dvds blu ray?
Answer: Disc Formats All Blu-ray players can play commercial Blu-ray discs and standard DVDs. ... A given model might play JPEG, WMA, or video CDs, or DVD-/+/R/RW or DVD-RAM discs you've recorded. Some Blu-ray and DVD players are "universal" models that can play higher-resolution SACD and DVD-Audio discs.