Display boot parameters of floppy

The following program has been written to read the DBR of Floppy and different parameters of the disk. However, you can also use it for FAT12 and Small FAT16 volumes of Hard Disks by specifying the appropriate Sector location of DBR and Physical Drive Number.

/* Display boot parameters of floppy */

# include <dos.h>
# include <stdio.h>

main( )
{

struct boot
{
unsigned char code[3] ; /* Jump Code */
unsigned char system_id[8] ;/* OEM Name and Version*/
int bytes_per_sec ; /* Bytes Per Sector */
char sec_per_clus ; /* Sectors Per Cluster */
int res_sec ; /* Reserved Sectors */
char fat_copies ; /* Number of FATs */
int root_dir_entry ; /* Number of Root
Directory Entries */
unsigned int no_sects ; /* Number of Sectors in
Logical Volume */
unsigned char format_id ; /* Media Descriptor Byte
*/
int sec_per_fat ; /* Sectors Per FAT */
int sec_per_trk ; /* Sectors Per Track */
int no_sides ; /* Number of Heads */
int no_sp_res_sect ; /* Number of Hidden
Sectors */
unsigned char rest_code[482] ; /* Rest of the code */
} ;

struct boot b ;
char temp[4] ;
int val, drive ;

val = absread(0, 1, 0, &b) ; /* Use For Floppy Disk*/

if ( val == -1 )
{
printf ( "Disk read Error...bad sector\n" ) ;
exit ( 1 ) ;
}

clrscr ( ) ;

printf ( "System ID = %s\n",
b.system_id ) ;
printf ( "Bytes per sector = %d\n",
b.bytes_per_sec ) ;
printf ( "Sectors per cluster = %d\n",
b.sec_per_clus ) ;
printf ( "Reserved sectors = %d\n",
b.res_sec ) ;
printf ( "FAT copies = %d\n",
b.fat_copies ) ;
printf ( "Root directory entries = %d\n",
b.root_dir_entry ) ;
printf ( "No. of sectors on disk = %u\n",
b.no_sects ) ;
printf ( "Media Descriptor Byte = %X\n",
b.format_id ) ;
printf ( "Sectors per FAT = %d\n",
b.sec_per_fat ) ;
printf ( "Sectors per track = %d\n",
b.sec_per_trk ) ;
printf ( "No. of sides = %d\n",
b.no_sides ) ;
printf ( "No. of reserved sectors = %d\n",
b.no_sp_res_sect ) ;

return 0;
}

If you run this program to test the DBR of 1.44M, 3½ Inch Floppy disk having 70 tracks, two sides, 18 sectors per track and 512 bytes in a sector, The Output of the Program will be displayed similar to as follows:

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