It seems obvious to me that these tags aren't needed. The question they are used in only tags them because the real hardware in question is a hard drive that will be used with a PS4.
I would say the PlayStation-4 tag should be allowed here (not sure how I feel about the PlayStation tag yet). Console tags give us context as to what the hardware is for, just like the laptop tag. I can see questions asking about other hardware that interacts with gaming consoles, i.e. what wireless keyboards work with my PS4 and Xbox One? This is of course assuming that gaming consoles are on-topic here.