Wii Backup Manager
Wii Backup Manager is an excellent program that can manage FAT32, NTFS and WBFS drives and convert between ISO, CISO, and WBFS files. The guide below will show you how to add ISO images to your FAT32 drive. The program splits your ISO images into 4GB parts when transferring to a FAT32 drive as that is the maximum size.
A computer with a WBFS, FAT32 or NTFS USB device inserted (FAT32 recommended, a guide on how to format can be found here).
Configuring the tool
1. Click on Drive 1 and choose your drive letter.
You will now see all games that you have on the Drive. Notice that there is information about your drive on the bottom.
2. After you have selected your drive in the Drive 1 tab, you can choose individual ISO, cISO or WBFS files or a folder to add to your drive.
Go to the Files Tab. Then choose "Add", then "Files" or "Folder".
3. Choose what games/images you want to transfer by using the check boxes. Then click on Transfer and choose Drive 1.
Let the program do it's work and your games will be on the Drive!
Wii Backup Manager can do drive to drive transfers in any combination of FAT32, NTFS & WBFS filesystems. Just set your drives on the Drive 1 and Drive 2 tabs. Choose what games you want to transfer from whatever drive by using the check boxes. Then click on Transfer and choose the opposing drive.