You need at least 45 GB free. The PKG is ~35GB, and the installation requires double that temporarily. After install, the game takes ~38GB.
Introduction: A Spartan Rage on Next-Gen Hardware God Of War 3 Ps4 Pkg
Copy both the base and update PKG files to the root of your exFAT USB drive. Do not put them in folders. You need at least 45 GB free
Physical PS3 discs are decaying. The PS3 store is erratic. By installing the PS4 PKG, you are preserving one of the greatest action games ever made on a more stable, faster platform. Introduction: A Spartan Rage on Next-Gen Hardware Copy
But for a specific niche of the gaming community—the homebrew, jailbreak, and digital backup enthusiast—the phrase means something very particular. It represents the ability to install, store, and launch this iconic title directly from a modified PS4’s hard drive.