函数名: absread, abswirte
功  能: 绝对磁盘扇区读、写数据
用  法: int absread(int drive, int nsects, int sectno, void *buffer);
int abswrite(int drive, int nsects, in tsectno, void *buffer);
程序例:
/* absread example */

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

int main(void)
{
  int i, strt, ch_out, sector;
  char buf[512];

  printf("Insert a diskette into drive A and press any key\n");
  getch();
  sector = 0;
  if (absread(0, 1, sector, &buf) != 0)
  {
    perror("Disk problem");
    exit(1);
  }
  printf("Read OK\n");
  strt = 3;
  for (i=0; i<80; i++)
  {
    ch_out = buf[strt+i];
    putchar(ch_out);
  }
  printf("\n");
  return(0);
}