#include <stdio.h>
#include <bios.h>

void main()
  {
    struct diskinfo_t di;
    unsigned short status;

    di.drive = di.head = di.track = di.sector = 0;
    di.nsectors = 1;
    di.buffer = NULL;
    status = _bios_disk( _DISK_VERIFY, &di );
    printf( "Status = 0x%4.4X\n", status );
  }