fat16

(computing) The version of the FAT series of file systems which uses a 16-bit file allocation table.

(often) FAT16B, the version of this file system storing the number of clusters in a volume as a 16-bit integer but using a 32-bit integer to represent the total number of sectors in a volume, allowing for larger volume and file sizes.

(very strictly) The original version of this file system, storing both the number of (real or virtual) disk sectors and the number of sector clusters in a volume as 16-bit integers.