FAT32 DOS Boot Record Format Offset sector BIOS disk Parameter Block BPB data area DOS Cluster Root Directory Entries Jump Code Flags Number Executable Code FAT 32 drive Extended Signature Magic Number

 
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The third major component of the boot sector is the BIOS Parameter Block (BPB). The disk parameter block is very important data area for DOS. It helps the DOS to find:

    • Bytes Per Sector
    • Sectors Per Cluster
    • Reserved Sectors
    • Number of FAT
    • Number of Root Directory Entries

    FAT32 DOS Boot Record Format

    Offset

    Description

    Size

    00H

    Jump Code + NOP

    3 Bytes

    03H

    OEM Name and Version

    8 Bytes

    0BH

    Bytes Per Sector

    2 Bytes

    0DH

    Sectors Per Cluster

    1 Byte

    0EH

    Reserved Sectors

    2 Bytes

    10H

    Number of Copies of FAT

    1 Byte

    11H

    Maximum Root Directory Entries (but Not Available for FAT32)

    2 Bytes

    13H

    Number of Sectors in Partition Smaller than 32MB (Therefore Not Available for FAT32)

    2 Bytes

    15H

    Media Descriptor (F8H for Hard Disks)

    1 Byte

    16H

    Sectors Per FAT (In Older FAT Systems and Not Available for FAT32)

    2 Bytes

    18H

    Sectors Per Track

    2 Bytes

    1AH

    Number of Heads

    2 Bytes

    1CH

    Number of Hidden Sectors in Partition

    4 Bytes

    20H

    Number of Sectors in Partition

    4 Bytes

    24H

    Number of Sectors Per FAT

    4 Bytes

    28H

    Flags (Bits 0-4 Indicate Active FAT Copy) (Bit 7 Indicates whether FAT Mirroring is Enabled or Disabled <Clear is Enabled>) (If FAT Mirroring is Disabled, the FAT Information is only written to the copy indicated by bits 0-4)

    2 Bytes

    2AH

    Version of FAT32 Drive (High Byte = Major Version, Low Byte = Minor Version)

    2 Bytes

    2CH

    Cluster Number of the Start of the Root Directory

    4 Bytes

    30H

    Sector Number of the File System Information Sector (Referenced from the Start of the Partition)

    2 Bytes

    32H

    Sector Number of the Backup Boot Sector (Referenced from the Start of the Partition)

    2 Bytes

    34H

    Reserved

    12 Bytes

    40H

    Logical Drive Number of Partition

    1 Byte

    41H

    Unused (Could be High Byte of Previous Entry)

    1 Byte

    42H

    Extended Signature (29H)

    1 Byte

    43H

    Serial Number or 32 – Bit Binary ID of Partition
    (Binary ID of 32 Bits provided by the OS itself)

    4 Bytes

    47H

    Volume Name of Partition

    11 Bytes

    52H

    FAT Name (FAT32 in this case)

    8 Bytes

    5AH

    Executable Code

    420 Bytes

    1FEH

    Executable Marker or Magic Number (AAH 55H)

    2 Bytes

     

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