Reading DBR of Floppy and Small Volumes Extended DOS Boot Record Format for FAT12 and FAT16 Information

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Reading DBR of Floppy and Small Volumes

The table given next represents the format of DBR of Floppy. The Partitions having FAT12 File System or FAT16 File system with less than or equal to 32MB size also have the similar DBR format.


DOS Boot Record  Format for FAT12 and FAT16

Offset

Size

Field

Default

00H

3

Jump

E9 XX XX or EB XX 90 (Hex)

03H

8

OEM ID

MSWIN4.0

 

BIOS Parameter Block

0BH

2

Bytes Per Sector

512

0DH

1

Sectors Per Cluster

(See Table of Cluster Sizes )

0EH

2

Reserved Sectors

1

10H

1

Number of FATs

2

11H

2

Number of Root Directory Entries

512/544

13H

2

Total Sectors in Logical Volume (Small, For Logical Volume Size Less than or Equal to 32 MB)

0

15H

1

Media Descriptor Byte

(See the Table of Media Descriptors)

16H

2

Number of Sectors Per FAT

Must Be Calculated

 

(End of BIOS Parameter Block)

18H

2

Sectors Per Track

Depends on Hard Disk, Usually 63

1AH

2

Number of Heads

Depends on Hard Disk

1CH

4

Number of Hidden Sectors

 

20H

4

Total Sectors in Volume (Large, Logical volume size greater than 32MB)

Size of the partition in terms of Sectors

 

Extended Boot Record Information (DOS 4.0 and Later)

24H

1

Physical Drive Number

80H

25H

1

Current Head                                    

0

26H

1

Extended Boot Signature Record

for WinNT, 28H else 29H

27H

4

Volume Serial Number
(32 – bit Binary Volume ID)

Random

2BH

11

Volume Label                                  

 1

36H

8

File System ID

FAT12, FAT16

 Total

62

 

 

 

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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