DOS Boot Record Format for FAT12 and FAT16 BIOS Parameter Sector Cluster Root Directory Entries Media Descriptor Byte Extended Information Physical Drive Signature File System Hard Disk WinNT FAT12 FAT16

 
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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

 

 

  • Total Sectors in Logical Volume (Small, For Logical Volume Size Less than or Equal to 32 MB)
  • Media Descriptor Byte
  • Number of Sectors Per FA
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