@NSonic79 I would go with number 3, assuming that the PS6 is going to be a hybrid console like the Switch.
@NSonic79 Sony possibly had that intention since the PS1 days. The story goes that they originally wanted to create a proprietary CD-based format that was slightly bigger than standard CDs. This would allow more data to be stored on the disc while also curbing piracy. This explains why the disc tray on the original PS1 model is bigger than it should be.