 Current digital cameras using FAT32 will break the video files into multiple segments of approximately 2 or 4 GiB.With the increase of capacity and the increase of data being transferred, the write operation needs to be made more efficient.SDXC cards, running at UHS-I have a minimum guaranteed write speed of 10 MBps and exFAT plays a factor in achieving that throughput through the reduction of the file system overhead in cluster allocation.