So wait, why can't PS4 have external HDD support?

[preddevils6]

Not sure why they don't. I got this one, and it was super easy to put in, it's literally as easy as sliding a cartridge in and out. I have also noticed my system runs a little smoother, with shorter load times. I personally prefer internal, because they do not take up extra space! 

http://smile.amazon.com/HGST-Travelstar-2-5-Inch-Internal-0J28001/dp/B00EDIU5IW/ref=smi_www_rcolv2_go_smi?_encoding=UTF8&*Version*=1&*entries*=0