The HTC HD2 is one of those devices that has made history on XDA due to the durable and long lasting body, great hardware, and its incredible versatility. Since it was originally ported back in the 2010-2011 time frame, Android has only been getting better and better, not to mention faster on the device. It went from running from the SD card to running from NAND in a short period of time. However, people wanted more responsiveness and smoothness out of the device. They wanted a closer experience to an actual Android device, without losing the flexibility of Windows Mobile. After thinking about it long and hard, XDA Recognized Contributors securecrt and Xylograph put their heads together and came up with a new way of flashing ROMs onto the device (be it WM or Android). Introducing NativeSD.
The concept behind this new method is actually quite interesting. The whole idea came from the fact that when choosing a flashing method on the HTC HD2, there is a trade off. NAND is faster than regular SD, but SD gives you more storage. The premise behind this is to combine the benefits of both. It turns out that speeds on some of the higher end class SD cards are actually faster than those of NAND (4 MB/s on NAND as opposed to about 10 MB/s on a Class 10 SD card). So, the devs devised a way to flash onto an Ext4 partition (which provides great performance enhancements on I/O). As an added bonus, your data partition becomes MUCH bigger than anything you could possibly achieve by flashing on NAND. All in all, a win-win situation for HD2 owners.
As an added bonus, this allows you to possibly flash multiple ROMs on the same device for multi-booting. Windows Mobile ROMs can be flashed as well, but it is still experimental. What are you waiting for? Take it for a spin and let the devs know if it works well by dropping some feedback and get your ORD going.
This is an idea to make the HD2 faster and fancy, I worked with Xylograph to make it more usable and easy to implement by common users.