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在NT和2000下，通过CreateFile来打开需要读写的驱动器，ReadFile、WriteFile来进行磁盘读写。

下面的代码演示了，如何读写A驱
/* -----------------------------------------------------

     Read Floppy Disk Sector for win NT/2000
     reads [numsec] sectors from [head] [track] [sector]

-------------------------------------------------------*/


char* ReadSectors(int head, int sector, int track, int numsec)
{


// getting logical sector from absolute head/track/sector ...
//计算扇区位置
int LogicalSector = (sector-1) +
          (head*SECTORSPERTRACK) +  
         (track*SECTORSPERTRACK*NUMOFHEADS) ;

char *buffer ;
HANDLE hDevice ;


HANDLE hDevice;
char* buffer = (char*)malloc (512*numsec);
strset ( buffer , ' ');
DWORD bytesread ;

// getting a handle to the drive a: using
//    CreateFile () function ....
//打开驱动器 \\.\A:
hDevice = CreateFile("\\\\.\\A:",
        GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE,
        NULL, OPEN_EXISTING, 0, NULL);

if (hDevice == NULL)
{
   MessageBox ("Failed !");
   return NULL;
}
     
   
// setting the file pointer to the start of the
//     sector we want to read .
//移动文件指针到需要读取位置
SetFilePointer (hDevice,
                 (LogicalSector*512),
                 NULL,
                 FILE_BEGIN);
   
// reading sector(s) ...
//读数据
if (!ReadFile ( hDevice,
                 buffer,
                 512*numsec,
                 &bytesread,
                 NULL) )
{
    /*
    int err;
    char error[10];
    err=GetLastError ();
    itoa (err, error, 10);
    MessageBox (error, "Reading sectors ...Failed  ");
    return NULL ;
    */
}
//关闭
CloseHandle(hDevice);

return buffer ;
}


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