Although CD and DVD are of the same sizes, their cases come in different sizes. If you wonder about it, there is a legit reason for it. Cinematic media like VHS tapes, movie posters, and even screens have always been rectangular, which is why DVD has a particular shape, and they even look like VHS tapes. On the other hand, music packaging is typically square. When the industry was shifting from VHS to DVD, they marketed DVD in shape and looks of VHS to make it look familiar to the customers. We hope now the size difference makes sense. It’s nothing but a marketing gimmick of previous times.