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https://www.gadget-rumours.com/playstation-4s-4-5-software-update-adds-support-for-external-hard-drives-boost-mode-to-ps4-pro-to-help-older-games-run-faster-and-smoother-chris-welchthe-verge/
PlayStation 4's 4.5 software update adds support for external hard drives, "Boost Mode" to PS4 Pro to help older games run faster and smoother (Chris Welch/The Verge)