With the 4.50 firmware update for the Sony PlayStation 4, you can use the 4TB PS4 External Hard Drivefrom Fantom Drives for extended storage.
Made specifically for the PS4, this aluminum external hard drive can expand the storage of your Sony gaming console without having to replace its internal hard drive. Just connect the hard drive to your PS4, PS4 Slim, or PS4 Pro gaming console via USB and use the extra 4TB for more games and applications. The hard drive is bus powered, but you also have the option to plug it into a power outlet.