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I need to get HDD serial number to use it as a key for licensing a software. I used diskid32 code in this url: http://www.winsim.com/diskid32/diskid32.html It used the DeviceIoControl Win32 API with the IO control code of IOCTL_STORAGE_QUERY_PROPERTY . It worked. However, when I double check with the actual serial number printed on the HDD itself, I found that every 2 bytes of the number was flipped. A simple solution could be to simply flip the bytes back. It worked in Windows XP, Vista and 7 but in windows 8 not need to be flipped! I wish to know the exact reason why the bytes were flipped in Windows XP, Vista and 7, and why not flipped in Windows 8. What about next Windows ? Part of code with minor changes: int drive = 0; HANDLE hPhysicalDriveIOCTL = 0; char driveName [256]; sprintf (driveName, "\\\\.\\PhysicalDrive%d", drive); // Windows NT, Windows 2000, Windows XP - admin rights not required hPhysicalDriveIOCTL = CreateFile (driveName, 0, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL); if (hPhysicalDriveIOCTL != INVALID_HANDLE_VALUE) { _STORAGE_PROPERTY_QUERY query; DWORD cbBytesReturned = 0; char buffer [10000]; memset ((void *) & query, 0, sizeof (query)); query.PropertyId = StorageDeviceProperty; query.QueryType = PropertyStandardQuery; memset (buffer, 0, sizeof (buffer)); if ( DeviceIoControl (hPhysicalDriveIOCTL, IOCTL_STORAGE_QUERY_PROPERTY, & query, sizeof (query), & buffer, sizeof (buffer), & cbBytesReturned, NULL) ) { _STORAGE_DEVICE_DESCRIPTOR * descrip = (_STORAGE_DEVICE_DESCRIPTOR *) & buffer;

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