The PlayStation 2's Open PS2 Loader (OPL) primarily uses the file system for USB drives. However, FAT32 has a strict 4GB file size limit . Since many PS2 games (like God of War or Final Fantasy X ) exceed this size, they cannot be copied directly to the drive. USBUtil-style apps solve this by:
Automatically detecting and naming games so they appear correctly in the OPL menu. Top USBUtil Alternatives for Android usbutil ps2 android
Since there is no "official" port of the Windows USBUtil, the community uses these specialized Android apps: How to Add Large 4GB PS2 Games to FAT32 USB for Free Mcboot The PlayStation 2's Open PS2 Loader (OPL) primarily