You don't want to use the DVD every time. Here’s how to make it permanent:
Now, every time you turn on your PS2 Slim, insert the Memory Card with uLaunchELF. You can launch OPL from it and play your USB games. Download Usb Extreme Ps2 Slim
USB Extreme is homebrew software developed by the team behind HD Loader (most notably associated with the "USB Advance" and "USB Extreme" brands). It acts as an interface that tricks the PS2 into reading game data from a USB mass storage device rather than the DVD drive. You don't want to use the DVD every time
For PS2 Slim owners, this is particularly attractive because the Slim’s internal hard drive bay was removed (unlike the older "Phat" models), leaving USB as the only storage expansion option. Now, every time you turn on your PS2
Connect your USB drive to your PC. For compatibility with most PS2 homebrew, format it as FAT32 using a tool like GUIformat (standard Windows formatting won't allow FAT32 for drives larger than 32GB). If your games are larger than 4GB (common for dual-layer DVD9 games like Gran Turismo 4), you can format as exFAT – newer OPL builds support it.
The PS2 Slim modding scene evolves weekly. New versions of OPL (like OPL 1.2.0 and the "Daily Builds") add features like:
The "USB Extreme" method from 2015 is now obsolete compared to OPL with exFAT + GUI. Always search for "Latest OPL PS2 Slim" rather than dated "Extreme" packs.