Stefan Mileschin

If the 1TB hard drive that comes with the PS4 Pro isn't enough storage for you, swapping it out for something bigger and faster will be easy enough. It should also be worth noting that the Pro uses SATA III, so an SSD upgrade may be much more sensible than it was with the original console, which used a slower interface. As is the case with the PlayStation 4 and the PlayStation 3, you will be able to swap out the internal hard drive for the PlayStation 4 Pro if you want to. The company told GameSpot that the PS4 Pro uses a SATA III interface, which supports solid-state drives that users can manually swap in to replace the existing hard drive, to scale up to 6 Gb/s. This is double the speed of the original PS4's SATA II interface, which scales up to 3 Gb/s. Microsoft's Xbox One and Nintendo's Wii U do not support swapping out internal hard drives, though you can add extra storage space with external hard drives on those consoles.
http://www.hardocp.com/news/2016/10/...le_hard_drive/