exFAT (Extended File Allocation Table) is a Microsoft file system optimized for flash drives. It is proprietary and patented. exFAT can be used where the NTFS file system is not a feasible solution (due to data structure overhead), or where the file size limit of the standard FAT32 file system is unacceptable.
If you plug into a ubuntu box and you get errors just run this in a terminal:
sudo apt-get install exfat-fuse exfat-utils
Then plug in the drive 🙂