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ex FAT was first introduced in late 2006 as part of Windows CE 6.0, an embedded Windows operating system.Most of the vendors signing on for licenses of ex FAT are either for embedded systems or device manufacturers that produce media that will be preformatted with ex FAT.Like NTFS and HFS , ex FAT is a proprietary file system.Microsoft asserts that ex FAT is covered by US Patent 8583708, Quick File Name Lookup Using Name Hash, which is an algorithm used in ex FAT to speed up file searches.This significantly reduces the CPU cycles because most file names are more than 2 characters (bytes) in size and virtually every comparison is performed on only 2 bytes at a time until the intended file is located.ex FAT introduces metadata integrity through the use of checksums. The Volume Boot Record (VBR) is a 12 sector region that contains the boot records, BIOS Parameter Block (BPB), OEM parameters and the checksum sector.When a file is accessed, the directory must be sequentially searched until a match is found.For file names shorter than 16 characters in length, one file name record is required but the entire file is represented by three 32-byte directory records.
Since Microsoft has not officially released the entire ex FAT specification, the Name Hash patent application is a key document in providing internal details in the understanding of the file system, since those details were revealed in Appendix A of the application.
ex FAT can be used where the NTFS file system is not a feasible solution (due to data structure overhead), yet the file size limit of the standard FAT32 file system (viz., 4 Gi B) is unacceptable.
ex FAT has been adopted by the SD Card Association as the default file system for SDXC cards larger than 32 Gi B.
Current digital cameras using FAT32 will break the video files into multiple segments of approximately 2 or 4 Gi B.
With the increase of capacity and the increase of data being transferred, the write operation needs to be made more efficient.
To provide improvement in the allocation of cluster storage for a new file, Microsoft incorporated a method to pre-allocate contiguous clusters and bypass the use of updating the FAT table and on December 10, 2013 the US patent office granted patent US8606830.