Wikipedia notes that "exFAT (Extended File Allocation Table) is a Microsoft file system optimized for flash drives. It is proprietary and patented".

exFAT is supported on modern Windows and OS X but Linux users may need to add additional software. The following steps work for Ubuntu (and variant) users. In Terminal, enter:

sudo apt-get install exfat-utils exfat-fuse

Then reboot the system.

sudo reboot