Yes, as long as one is a Fat32 and the other is a WBFS partition, the capacity for each is for you to decide.Ok I formatted the 64g split to FAT32 and the RAW I reformatted to NTFS and then formatted to WBFS through Wii Backup Manager. Now I have a 64g FAT32 split for GC and a 170g split for Wii. Should that work?