On the 14th of August 1984., the IBM PC AT Released, which contains 20 DVDs, hard disk and PC DOS 3.0. Microsoft, MS-DOS 3.0 in parallel to the introduced. The address cluster to 16-bit is increased, which allows a maximum of 65, 524 clusters per volume and, consequently, the size of the file, the file system much more. However, the maximum number of allowed sections and the maximum (partition, rather than disk) size of 32 MIB did not change. Thus, although the address of the cluster 16 bits. this format today as FAT16 not be known. A type of Partition 0x04 this form of FAT16 with less than 65536 sectors (less than 32 MB for the size of the Section 512).