What is the term for an LCD readout that is, by design, still visible after power-off?
The WD harddrives use E Ink. E Ink is a type of Electronic Paper display created and produced by E Ink Co. It's one of the most well known and popular types. So much that people often refer to all electronic paper displays as E Ink (Similar to how iPod/iPhone, Google, and Photoshop are commonly used to refer to any similar product, however wrongly)