edk2 fat driver - lzeng14/tianocore GitHub Wiki
EDK II FAT Driver
File Allocation Table (FAT) - https://en.wikipedia.org/wiki/File_Allocation_Table
https://github.com/tianocore/edk2/tree/master/FatPkg
https://github.com/tianocore/edk2/tree/master/FatBinPkg
Prior to April 2016, the FAT driver was a separate EDK II based project due to licensing issues. As of April 2016 it is merged into the EDK II project.
Refer to the Code Contributions page for more information on contributing to the EDK II FAT driver.