USB loading with USBUtil is an excellent starting point. It's how most people begin their journey into PS2 homebrew. However, if you are serious about the experience, upgrading to SMB (if you have a compatible network setup) or Internal HDD (for phat consoles) provides a vastly superior, near-disc-like experience.
You find a used PS2 fat (SCPH-39001) at a garage sale. No games, no memory card. You want to play backups from an internal HDD. Usbutil 3.0 Ps2
Go to OPL Settings and ensure that is set to Auto . USB loading with USBUtil is an excellent starting point
Offers a simple, albeit dated, interface to manage your game library. How to Use USBUtil 3.0 PS2: Step-by-Step You find a used PS2 fat (SCPH-39001) at a garage sale
: Choose your USB drive as the destination. The software will automatically split the file if it exceeds 4GB. Load on PS2
Splitting files creates high fragmentation on USB drives, which leads to black screens on launch. Always run a defragmentation tool (like Defraggler) on your USB drive after adding new games.