c++ - C++ - 如何指定 MBR 的偏移量？

Question

我已经能够进行修改，使得 MBR 被 0 值覆盖。但是，是否有可能使我只覆盖 MBR（引导签名）的最后 2 个字节（55h AAh）成为 00h 00h ？我的代码是：

char dataWrite[3] = "\x00\x00";

// Create file of physical drive
HANDLE MasterBootRecord = CreateFile("\\\\.\\PhysicalDrive0"
    , GENERIC_ALL, FILE_SHARE_READ | FILE_SHARE_WRITE
    , NULL, OPEN_EXISTING, NULL, NULL);


// Set file pointer
DWORD dwPtr1 = SetFilePointer(MasterBootRecord, 510, NULL, NULL);

if (dwPtr1 == INVALID_SET_FILE_POINTER) // Test for failure
{
    cout<< "\n\nSetFilePointer Failed to write,Err No: "<< GetLastError();
    Sleep(5000);
    ExitProcess(0);
} 

// Write to file
if (WriteFile(MasterBootRecord, dataWrite, 512, &write, NULL)) {
    cout << "Boot signature overwritten." << endl;
    Sleep(5000);
    ExitProcess(0);
} else...

结果证明是成功的，但是写入 MBR 的值是错误的。我对 C++ 比较陌生，因此对此有点困惑。任何帮助将不胜感激。谢谢