razdel=CreateFileA("\\\\.\\H:",
        GENERIC_READ,
        FILE_SHARE_READ | FILE_SHARE_WRITE,
        NULL,
        OPEN_EXISTING,
        0,
        NULL))

BOOL WINAPI ReadFile(
  _In_         HANDLE hFile,
  _Out_        LPVOID lpBuffer,
  _In_         DWORD nNumberOfBytesToRead,
  _Out_opt_    LPDWORD lpNumberOfBytesRead,
  _Inout_opt_  LPOVERLAPPED lpOverlapped
);

 if ((razdel = CreateFileA("\\\\.\\H:", GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE,0,OPEN_EXISTING,0,0)) == INVALID_HANDLE_VALUE)
    {
        cout << "Error: " << GetLastError() << endl;
        return (-1);
    }
    buffer=new char[6];
    LPDWORD k=0;
    if(!ReadFile(razdel,buffer,5,k,0))
    {
        cout << "Error: " << GetLastError() << endl;
        return (-1);
    }

DWORD k;
    if(!ReadFile(razdel,buffer,5,&k,0))
    {
        cout << "Error: " << GetLastError() << endl;
        return (-1);
    }