Are you setting this up for an or the Dolphin emulator ?
You must have the Homebrew Channel installed on your console.
The safest and most legally sound way to build your WBFS archive is to use a homebrew application called CleanRip on your Wii console. This allows you to insert your physical retail discs and rip them directly to an attached USB drive as a clean backup. wii wbfs archive
Original ISOs are too large for the 4 GB file size limit of FAT32 drives. WBFS files can be split or simply fit natively on FAT32 partitions. How to Build and Manage Your WBFS Archive
If you prefer to play your archive on a PC, Mac, or Android device in HD resolutions, you do not need a modded Wii. Are you setting this up for an or the Dolphin emulator
To help you get started with the best setup for your specific needs, let me know:
This is the most popular homebrew application used to read your WBFS archive. It provides a beautiful graphical interface displaying your game covers. This allows you to insert your physical retail
Transfer games directly to a FAT32 or NTFS formatted USB drive.