The file system of the iData Pro 16GB and 32GB is FAT32, however, the 64GB, 128GB, and 256GB is EXFAT. Why?
The Windows system uses FAT32 as the default format for the 16GB and 32GB external flash drives while it uses EXFAT as the default format for 64GB, 128GB, and 256GB models. If you need to format the iData Pro during use, follow the default format on the Windows system. FAT32 supports transfer of files under 4G and EXFAT supports files over 4G.