LPCWSTR pszDrive = "D:\\Newfolder";
	BOOL test, fResult;
	__int64 lpFreeBytesAvailable, lpTotalNumberOfBytes, lpTotalNumberOfFreeBytes;
		DWORD dwSectPerClust, dwBytesPerSect, dwFreeClusters, dwTotalClusters;
		test = GetDiskFreeSpaceEx(
		pszDrive,
		(PULARGE_INTEGER)&lpFreeBytesAvailable,
		(PULARGE_INTEGER)&lpTotalNumberOfBytes,
		(PULARGE_INTEGER)&lpTotalNumberOfFreeBytes
		);
		printf("Total number of free bytes on disk: %ul\n", lpTotalNumberOfFreeBytes);
		printf("Total number of free bytes available for user-caller: %ul\n", lpFreeBytesAvailable);
		printf("Total number of bytes available for user: %ul\n", lpTotalNumberOfBytes);

		fResult = GetDiskFreeSpace(pszDrive,
		&dwSectPerClust,
		&dwBytesPerSect,
		&dwFreeClusters,
		&dwTotalClusters);
		printf("\nUsing GetDiskFreeSpace()...\n");
		printf("The return value: %d, error code: %d\n", fResult, GetLastError());
		printf("Sector per cluster = %ul\n", dwSectPerClust);
		printf("Bytes per sector = %ul\n", dwBytesPerSect);
		printf("Free cluster = %ul\n", dwFreeClusters);
		printf("Total cluster = %ul\n", dwTotalClusters);
		// Using GetDiskFreeSpace() need some calculation for the free bytes on disk
		printf("Total free bytes = %ul\n", (dwFreeClusters*dwSectPerClust*dwBytesPerSect));