About the hard drive, not really. Most external HDD's these days are pretty standard and will be compatible with PS4.
I upgraded about a year ago to this one. 2TB. I never have to delete anything anymore.
https://www.amazon.ca/Seagate-Portable-External-Storage-STDR2000100/dp/B00FRHTSK4/ref=sr_1_2?s=pc&ie=UTF8&qid=1480023478&sr=1-2However, with this one I said fuck it. I actually ended up popping the hard drive right out of the case that it gets shipped in, opened up my PS4 and actually turned that EXTERNAL into an INTERNAL and now it is inside my PS4.
Now I have 2TB in my PS4, and the PS4 one I put in the external hard drive case and can use that one for external

You could always do that, so your biggest hard drive is actually in your PS4. If you do that method, MAKE SURE YOU BACK UP. I didn't back up because I didn't really give a fuck, and just re-downloaded everything.
This post was edited by Bassist on Nov 24 2016 03:42pm