I understand the current OS only support FAT32. The problem with FAT32 is that it can not store single files bigger than 4 GB while exFAT can. While most average joes would not have single files bigger than 4GB but on some occassion, full HD video files can be bigger than 4GB (or maybe work files).
Android Jelly Bean 4.2.2 supports exFAT
I wonder if the newer OS would support exFAT FS.
Anyone know?