Program to modify the values of partition table entry of MBR

 
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Modify MBR by Programming

The sample program to show, how we can modify the values of MBR partition table entry has been given below. The program modifies the values second partition entry of MBR partition table.

The coding of the program has been given below:

/* Program to modify the values of partition table entry of MBR */

# include <bios.h>

/* structure to read the partition entry from partition table */

struct partition
{
unsigned char bootable ; /* Active Partition Byte */
unsigned char start_side ; /* Starting Head */
unsigned int start_sec_cyl ; /* combination of Starting sector and cylinder number */
unsigned char parttype ; /* File system Indicator Byte */
unsigned char end_side ; /* Ending Head */
unsigned int end_sec_cyl ; /* combination of Starting sector and cylinder number */
unsigned long part_beg ; /* Relative Sector Number */
unsigned long plen ; /* Partition length in sectors */
} ;

/* Structure to read MBR */

struct part
{
unsigned char master_boot[446] ; /* IPL (Initial Program Loader)*/
struct partition pt[4] ; /* Partition table*/
int lasttwo ; /* Magic Number */
} ;

struct part p ;

void main()
{
unsigned int t1,t2;
clrscr();

biosdisk ( 2, 0x80, 0, 0, 1, 1, &p ) ;
display(); /* display the partition Table information */

getch();

/* Let us assume that we want to modify the partition information of second partition entry from partition table of MBR, with these values */

p.pt[1].bootable = 0x80; /* Active Boot Partition */

p.pt[1].parttype = 0x7; /* NTFS Partition */

p.pt[1].start_side = 0; /* Starting Head =0 */

p.pt[1].end_side = 31; /* Ending Head == 31 */

p.pt[1].part_beg = 808416;/* Relative Sector = 808416 */

p.pt[1].plen = 405216; /* Total Sectors in Partition = 405216 */


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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