Turns out all you need to upgrade a PS4 to 4TB internal Storage is a Dremel and a 3D Printer : r/PS4
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How to Upgrade Your PS4's Hard Drive
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List of PS4 Compatible External Hard Drives - Startech Store
How to upgrade your PS4 hard drive (without losing P.T.) | GamesRadar+
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Best PS4 external hard drives | TechRadar
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