Speed: If all you’ll use your drive for is playing discs, just about any drive you buy will perform similarly.We didn’t require Blu-ray drives to support reading and writing to Ultra HD (or UHD, or 4K) Blu-ray discs, but we considered it a nice bonus if you didn’t have to pay much more for that feature. Read and write capability: DVD drives must read and write DVDs and CDs, and Blu-ray drives must read and write Blu-rays, DVDs, and CDs.
