To ensure OPL recognizes it, rename it using the correct game ID prefix if necessary, or simply paste it into the DVD folder if you are using a modern version of OPL that supports long filenames without IDs.
The PS2 hardware reads discs using strict ISO 9660 or UDF file systems. Packaging 7,000+ files into a single directory often breaks the directory index limit that the PS2 homebrew software can read. super collection 7784 classic games iso ps2 work
Ensure your USB flash drive or internal hard drive is formatted to the FAT32 file system. OPL cannot read NTFS or exFAT formats without advanced configuration. To ensure OPL recognizes it, rename it using