Western Digital has announced another external hard drive, this one called the My Passport Edge. Available in both Mac and PC flavors, the My Passport Edge is all about compact portability. the drives are about the size of a deck of cards and can hold up to 500GB of data, passed back and forth over speedy USB 3.0. The Mac version is configured with out-of-the-box Time Machine compatibility and sports a brushed aluminum finish for $119, while the PC version includes custom backup SmartWare backup software and black exterior for $109. Both are available now.