“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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One reason I can think of is to fit more hours on a disc. Might be good for long videos, or for multiple videos that you'd like to join together.
Although it's true, BD-R discs are still expensive, while DVD-R's are super cheap.