dd if=/dev/hda of=/tmp/mbr bs=512 count=1

#include <windows.h>

int
main() {
	HANDLE hFile;
	char buf[512];
	DWORD junk;

	hFile = CreateFile("\\\\.\\PhysicalDrive0", MAXIMUM_ALLOWED, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
	if (hFile == INVALID_HANDLE_VALUE)
		goto fail;

	if (!ReadFile(hFile, buf, sizeof(buf), &junk, NULL))
		goto fail;

	CloseHandle(hFile);

	hFile = CreateFile("mbr.bin", MAXIMUM_ALLOWED, FILE_SHARE_READ, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
	if (hFile == INVALID_HANDLE_VALUE)
		goto fail;

	if (!WriteFile(hFile, buf, sizeof(buf), &junk, NULL))
		goto fail;

	return 0;

fail:
	if (hFile != INVALID_HANDLE_VALUE)
		CloseHandle(hFile);
	return -1;
}