File Allocation Table 16. FAT16, as we know it today, was introduced in 1987 although it did not come into wide use until 1988 with the introduction of MS-DOS 4.0. Technically FAT16 was introduced in 1984 with MS-DOS 3.0. 16 bits were used for cluster addressing, but the maximum number of allowed clusters did not increase and the maximum partition size was only 32MB. Fat16 as we know it today, based on the usual 512 byte sector size, has a maximum partition size of 2 Gigabytes. FAT16 does not natively support alternate data streams or file permissions and it is not a journaling file system.