Volume Layout

Offset, sectors Size, sectors Block Comments
Main Boot Region
0 1 Boot Sector
1 8 Extended Boot Sectors
9 1 OEM Parameters
10 1 Reserved
11 1 Boot Checksum
Backup Boot Region
12 1 Boot Sector
13 8 Extended Boot Sectors
21 1 OEM Parameters
22 1 Reserved
23 1 Boot Checksum
FAT Region
24 FatOffset - 24 FAT Alignment Boot Sectors contain FatOffset
FatOffset FatLength First FAT Boot Sectors contain FatOffset and FatLength
FatOffset + FatLength FatLength Second FAT For TexFAT only
Data Region
FatOffset + FatLength * NumberOfFats ClusterHeapOffset - (FatOffset + FatLength * NumberOfFats) Cluster Heap Alignment
ClusterHeapOffset ClusterCount * 2SectorsPerClusterShift Cluster Heap
ClusterHeapOffset + ClusterCount * 2SectorsPerClusterShift VolumeLength - (ClusterHeapOffset + ClusterCount * 2SectorsPerClusterShift) Excess Space