The latest products out of Irvine disk drive maker Western Digital are a set of two new, ultra-compact hard drives. WD announced its My Passport Edge and My Passport Edge for Mac, the latest portable hard drives in its line, featuring 500GB of storage and a USB 3.0 interface on Thursday. The devices are 3.2 inches long, 4.3 inches wide, and only half an inch high. The new drives start at $109.99.