SmartDisk Corp. said today that it is now shipping the FireFly USB 2.0 20GB portable hard drive. About the size of a deck of playing cards (2.5 by 4 by .5 inches), the FireFly weighs 3.3 ounces and has a suggested retail price of US$189.99. It can store up to 20 hours of video, more than 5,000 MP3 songs or over 15,000 high-quality digital photographs.