What is the maximum file size in a FAT32 system? Solution First note that there are three varieties of FAT: FAT12, FAT16 and FAT32. @ FAT12 had a maximum file size of 12mb, it was used for floppy disks. @ FAT16 was used on hard drivers up to 4GB, and had a cluster size that varied from 2kb to 64 kb,it is never used anymore because nobody has partitiona as small as 4GB. @ FAT32 took over from FAT16 and has a maximum drive size of 2TB. ITS MAXIMUM FILE SIZE IS 4GB, Its cluster size is 4KB up to apartition of 8GB. Above 8GB the cluster size grows upto 32kb..