The PS4 has a 500GB 2.5-inch SATA HDD, these are the same as many laptops but you must ensure that any drives you buy are less than 9.5mm thick, otherwise it won’t fit inside the PS4.
Because of the thickness issue it does limit your choices, especially when considering a 2TB drive.
► 2TB USB3 drive for £53.99 (once added to basket) >http://ebay.to/1MNkFMz
Seagate 1TB SSHD roughly £69.99
This is often a cheaper solution that buying a drive ready to be installed however you must be careful as some drives have direct USB 3 ports ‘welded’ on to the drive. You must ensure the drive inside has a SATA connector
This is a great option and will improve speed, lower heat and reduce noise but will increase the cost as anything above 500GB will cost you a small fortune.
Samsung 500GB SSD £107 or check out the 1TB+ drives on the same link