When replacing the hard drive, you can use a standard SATA II hard drive or use a solid state (flash) drive no thicker than 9.5mm. As of the 4.5 system update, ...
Remove the large screw underneath, then slide the drive cage out the side of the PS4 using the black ribbon. Unscrew the four screws holding the drive in place ...
This guide will show you how to upgrade your PS4 hard drive, including instructions for the PS4 Slim and PS4 Pro and a video to walk you through everything.