Since PS2 USB drives must be formatted to FAT32, they cannot hold files larger than 4GB. USBUtil splits these games into numbered segments (e.g., ul.01 , ul.02 ) that OPL can reconstruct seamlessly. Core Features that Make it "Top" Tier

Automatically breaks down large ISO files into .ul segments that FAT32 can handle.

: Ensure your USB drive is primary, active, and formatted to FAT32 .

Right-click the usbutil.exe file and select Run as Administrator . Without this, the tool cannot access low-level USB sectors.