I bought a 1TB disk and just wanted to format it on the ps4 and issuer. When I wanted to do that, a notification came that my hard drive either doesn't have a USB 3.0 port, is not the right size (250GB-8TB) or that it is not directly connected to the ps4. But it is connected to the ps4 via the USB port, has a USB 3.0 port and, as I said before, is 1TB in size.
I have little idea about external hard drives for the PS4 but a lot of knowledge about PCs, how do you connect them when you just connect them to the PC with USB and format everything that's on it.