That is why users tend to utilize this external hard drive for more disk space. Here, as for what WD My Password Ultra is Used for, in simple words, WD is short for Western Digital and My Password Ultra refers to the portable hard drive with large capacity for you to store all the huge volumes of contents. This post is designed to walk you through this WD hard drive issue. Or for some of you, you observed that My Password Ultra light is blinking but not working on Windows 10. It is a common phenomenon that your PC can’t recognize, detect, and access the WD My Password Ultra drive. How to Fix Western Digital My Password Ultra Not Detected on Windows 10, 8, 7?