The structure partition is used to read the various parameters of partition entry

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The information given by the output of the program is displayed something like as given below:

Part.Type Boot Starting location Ending Location Relative Sectors Number of Sectors
    Side Cylinder Sector Side Cylinder Sector    
FAT32 Yes 1 0 1 254 701 63 63 11277567

VFAT EXT

No 0 702 1 254 1023 63 11277630 28724220
Unused No 0 0 0 0 0 0 0 0
Unused No 0 0 0 0 0 0 0 0

Comments on coding:

The structure partition is used to read the various parameters of partition entry of partition in partition table of MBR. The structure part is used to read MBR information.

The function display() displays the information of MBR Partition Table parameters on the screen. As we see the output of the program, the starting and ending cylinder and sector number are displayed as follows:

Starting Sector = 1
Starting Cylinder = 0

Ending Sector = 63
Ending Cylinder = 701

These sector and cylinder numbers are calculated from the combination of two bytes. The following tables show that how these numbers are calculated:

00H (Byte At Offset 03H)

01H (Byte At Offset 02H)

7

6

5

4

3

2

1

0

7

6

5

4

3

2

1

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

1

Bits 7 to 0 For Cylinder Number

Cylinder Bits 9, 8

Sector Bits 5 to 0

Cylinder Number =
0000000000 (B) = 0

Sector Number =
000001(B)=1

Thus Starting C-H-S of the partition= 0-0-1.

Similarly, the Encoding for the Ending Cylinder and Sector number of the partition have been given in the next table:

 

BDH (Byte At Offset 07H)

BFH (Byte At Offset 06H)

7

6

5

4

3

2

1

0

7

6

5

4

3

2

1

0

1

0

1

1

1

1

0

1

1

0

1

1

1

1

1

1

Bits 7 to 0 For Cylinder Number

Cylinder Bits 9, 8

Sector Bits 5 to 0

Cylinder Number =
1010111101 (B) = 701

Sector Number =
111111 (B) = 63

Thus the Ending C-H-S of the Partition = 701-254-63.

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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