If you break it down to average gaming numbers, that's roughly 100 HD games or 40 Pro 4K games, depending on what you're downloading onto the drive.
As to the amount, this model comes with 4TB of space. All you need to do is go into your options and have the PS4 recognize the device as bonus storage. This version of the My Passport doesn't come with any special software or special setup to work with a PS4. This was meant to be as hassle-free as possible while also being easy to transport. The only item that this comes with is a USB 3.0 cord (blue, of course) to plug into the front of the console with enough slack to move it behind or to the side of the PS4, which also serves as the power source for the unit. 75', slightly smaller than what they make for most PC and Mac units. This is pretty much an averagely sized design for what WD is producing these days, meaning it's compact enough to be mobile as well as not take up a ton of space on whatever area you're storing your console. First off, let's get straight to the design.