Wikipedia
File Allocation Table (FAT) is a file system developed for personal computers Originally developed in 1977 for use on floppy disks, it was adapted for use on hard disks and other devices It is often supported for compatibility reasons by current operating systems for personal computers and many mobile devices and embedded systems, allowing interchange of data between disparate systems The increase in disk drives capacity required three major variants: FAT12, FAT16 and FAT32 The FAT standard has also been expanded in other ways while generally preserving backward compatibility with existing software FAT is no longer the default file system for Microsoft Windows computers
File_Allocation_Table#FAT32 - Wikipedia, the free encyclopedia