[temp t13] Reading sectors with Int 13h

[Jas]

If it helps you out, I use the following for all of my low level stuff:     /*************** READ A SECTOR FROM SELECTED DEVICE ************************/ int read_sector(struct dinfo *_dinfo,unsigned int *buffer) {  REGS regs;  SREGS sregs;    struct      // INT86 packet structure  {   char packet_size;   char reserved;   unsigned int number_of_blocks;   void far * buffer;   unsigned long lba0;   unsigned long lba1;  } control;    control.packet_size = 0x10;  control.reserved = 0;  control.number_of_blocks = 1;  control.buffer = (char far*) buffer;  control.lba1 = 0;  control.lba0 = _dinfo->lba;    regs.h.ah = 0x42;       // extended 'read' of sector  regs.h.dl = _dinfo->device_number;  regs.x.si = FP_OFF(&control);  sregs.ds = FP_SEG(&control);  int86x(0x13,&regs,&regs,&sregs);    if(regs.h.ah == 0)      // check for success   return (TRUE);  else  {   printf("\nError reading from Device %xh, Error code: %.2xh",_dinfo->device_number,regs.h.ah);   return(FALSE);  }; };   /************** WRITE A SECTOR TO THE SELECTED DEVICE **********************/ int write_sector(struct dinfo *_dinfo,unsigned int *buffer) {  REGS regs;  SREGS sregs;  int i;    if (_dinfo->device_number == 0x80)  {   printf("\nCannot write to device: 0x80 !!!!!!!!");   getch();   exit(0);  };    struct      // INT86 packet structure  {   char packet_size;   char reserved;   unsigned int number_of_blocks;   void far *buffer;   unsigned long lba0;   unsigned long lba1;  } control;    gotoxy(1,1);                    // display which sector is being written  printf("Processing : Writing sector: %lx",_dinfo->lba);    control.packet_size = 0x10;  control.reserved = 0;  control.number_of_blocks = 1;  control.buffer = (char far*) buffer;  control.lba1 = 0;  control.lba0 = _dinfo->lba;    regs.h.ah = 0x43; // 'extended write' code  regs.h.al = 0x00;  regs.h.dl = _dinfo->device_number;  regs.x.si = FP_OFF(&control);  sregs.ds = FP_SEG(&control);  int86x(0x13,&regs,&regs,&sregs);    if(regs.h.ah == 0)   return(TRUE);   // check if OK  else  {   printf("\nError writing to Device %xh, Error code: %.2xh",_dinfo->device_number,regs.h.ah);   return(FALSE);  }; };