FAT File Systems - USB Mass Storage: Designing and Programming Devices and Embedded Hosts - page 176

Figure 8-1: Windows Explorer enables formatting logical drives.
(Figure 8-1) shows the media's capacity and a combo box that enables select-
ing FAT (for FAT16) or FAT32. File systems that aren't suitable for the
media don't display in the combo box. The default allocation size (cluster
size) is likely to be the only option presented. You can also enter a Volume
label for the media. Click Start to format the volume. Another option is to
use the format command at a command prompt. The /a parameter enables
setting a cluster size. Type help format at the command prompt for a list of
supported parameters. Remember that formatting destroys all data in the
volume.
Reserved Region
The first region in a FAT16 volume is the reserved region, which consists of
a single sector called the boot sector. The boot sector begins at the LBA
value stored in the MBR sector's partition table, in byte 8 of the volume's
entry in the table. In media that doesn't have a master boot record, the boot
sector is the first sector. The sector contains a BIOS Parameter Block (BPB),
an area reserved for boot code, and a boot signature.