Archos today announced the MiniHD, a 20GB ultra-slim hard drive that it bills as the world’s smallest and lightest. Like SmartDisk’s similar FireFly 20GB, the MiniHD is avaialble exclusively with USB 2.0 connectivity, which the Mac OS currently only offers limited support for. The drive is backwards-compatible with USB 1.1, however. The MiniHD is available now for US$199.99.