HDD mobile phone design was inspired by HTC smartphone. HDD is a smartphone designed with dual operating system, just plug HDD in your computer and follow the software instructions. You can choose between Windows Phone 7 or Android 2.2 as your OS. Similar to HTC Touch Diamond, HDD also features screen rotation. It is equipped with 10 Megapixel camera at the back, front camera for video call, 32GB internal memory, wi-fi, and much more.