Mkdosfs

mkdosfs is one of the applications that are included in the dosfstools package, and it is used to create a FAT file system under Linux on a data storage device (usually a disk partition).
Usage.
 mkdosfs [options] device
You may specify the number of blocks on the device or allow mkdosfs to guess
Known issues.
mkdosfs does not support creating boot-able partitions.