Back up files first if you want I didn't Take off PS4 cover and use small screw driver to take out hard drive once it's out unscrew the four screws to release the hard drive and put new one in than go to PlayStation.com and install the latest update by following the guide they have to install the update onto a USB drive. Hold down the power button until you hear a second beep and choose initialize PS4 and set up PS4 as if it was a new PS4 check storage and you should have around 1.77 gb