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Fat32

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Boot Sector and BPB Structure-> BPB_NumHeads [Offset=26, Size=2]
Boot Sector and BPB Structure-> BPB_RootEntCnt [Offset=17, Size=2]
Boot Sector and BPB Structure-> BPB_RsvdSecCnt [Offset=14, Size=2]
Boot Sector and BPB Structure-> BPB_SecPerClus [Offset=13, Size=1]
Boot Sector and BPB Structure-> BPB_SecPerTrk [Offset=24, Size=2]
Boot Sector and BPB Structure-> BPB_TotSec16 [Offset=19, Size=2]
Boot Sector and BPB Structure-> BPB_TotSec32 [Offset=32, Size=4]
Boot Sector and BPB Structure-> BS_jmpBoot [Offset=0, Size=3]
Boot Sector and BPB Structure-> BS_OEMName [Offset=3, Size=8]
Boot Sector and BPB
BootSector
Cylinder

Fat32 - BootSector

(ie:, the first sector in each partition). It stores information like the number of sectors/cluster, the partitionsize, the number of sectors/FAT and the number of sectors in the partition. Also it has code to load IO.SYS and MSDOS.SYS which are used by the boot process which is of course only used in the active, primary partition that is used to boot.

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