Reading the DBR of Large Volumes format of DOS Boot Record of a FAT32 volume

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Reading the DBR of Large Volumes

The Partition volumes which are greater than 32MB in size have some different format of DBR than the DBR for less then or Equal to 32MB Volumes.

It is so to provide the support to large Volumes of the disk (For a Detailed description on it, refer the chapter “Logical Approach to Disks and OS”, Discussed earlier in this book).

The format of DOS Boot Record of a FAT32 volume has been given in the following table:

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

Sample Chapters from book DATA RECOVERY WITH AND WITHOUT PROGRAMMING by Author Tarun Tyagi
Data Recovery with & without Programming


Publishers of the Book
Number of Pages
ISBN
Price of the Book


BPB Publications, New Delhi, India
540
81-7656-922-4
$69.00 (Including Shipping Charges, Cost of Book and Other expenses, Free Source Code CD included with the Book)





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