Network, Computer and Programming Resources

Fat32 - Boot Sector and BPB Structure-> BPB_NumHeads [Offset=26, Size=2]

Number of heads for interrupt 0x13. This field is relevant as discussed earlier for BPB_SecPerTrk. This field contains the one based “count of heads”. For example, on a 1.44 MB 3.5-inch floppy drive this value is 2.