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 * 2^SectorsPerClusterShift

Cluster Heap

 

ClusterHeapOffset + ClusterCount * 2^SectorsPerClusterShift

VolumeLength – (ClusterHeapOffset + ClusterCount * 2^SectorsPerClusterShift)

Excess Space

 

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