Download a standard, non-compressed Folder format game. Before transferring, delete the UPDATE folder (usually 200MB–2GB useless). Also, delete foreign language video files (e.g., keep EN, delete FR/SP).
Many physical PS3 Blu-ray discs contain massive amounts of "dummy data" or padding files. Developers added this dummy data to fill up the outer edges of the Blu-ray disc, which allowed the physical laser disc drive of the PS3 to read the data faster. Since digital emulators and modern hard drives do not need physical lasers, this dummy data can be safely deleted, saving gigabytes of space instantly. Do Highly Compressed PS3 Games Work? ps3 games highly compressed work