exFAT (Extended File Allocation Table), (also sometimes referred to as FAT64). This is a file system created by Microsoft for flash media. Microsoft introduced the new exFAT file system with Vista SP1. Extended File Allocation Table (exFAT) is the successor to the old FAT32 file system.
The maximum file size on a FAT32 formatted drive is around 4 GB while exFAT file size limit is 16 exabytes. Like HPFS, exFAT uses free space bitmaps to reduce fragmentation and free space allocation/detection issues.
exFAT is not used and was not designed for formatting hard drives. It is only recommended in flash memory storage and other external devices only. This is why it is currently not considered a huge competitor to NTFS on hard drives.
Microsoft Control and Legal Issues
Microsoft has not released the official exFAT file system specification, and a restrictive license from Microsoft is required in order to make and distribute exFAT implementations. Microsoft also asserts patents on exFAT which make it impossible to re-implement its functionality in a compatible.
Companies can integrate exFAT into a specific group of consumer devices, including cameras, camcorders, and digital photo frames for a flat fee. Mobile phones, PCs, and networks have a different volume pricing model.[3]
Microsoft has entered into licensing agreements with BlackBerry,[24] Panasonic, Sanyo, Sony, Canon and BMW.