Cowon UM1 - the smallest usb memory stick? This is the new luxury USB memory stick from Cowon. This South Korean manufacturer has given news on this Cowon UM1 to be a tiny metallic cased USB memory stick, at only 31 x 12 x 3 mm (it's paperclip size). With clean styling and a high end look, with this memory stick round your neck you will always be able to carry your work and entertainment where ever you go. With a range of memory capacities (2-16GB) available, and the special feature of being waterproof this is a top memory stick! Cowon UM1 memory stick