My Passport Essential drives are powered via USB and utilize 2.5-inch mechanisms inside. They’re designed to be easy to carry, and include a USB 2.0 cable to connect to a Mac or PC.
The Passport Essential hard drives are Mac and PC-compatible, though Western Digital includes software that is Windows-compatible only. It lists the drive as being compatible with Mac OS X v10.4.11 or later.
The drive is already available in black. New colors include orange, yellow, blue, white, violet, red, green, red, dark blue and pink.