Netac Technology says its OnlyDisk U220 is the world’s smallest USB flash drive with built-in security. It weighs a half an ounce and it’s just 2 inches tall, yet the highest-capacity is 2GB. Pricing for the 512MB, 1GB and 2GB versions runs $44, $55 and $92. It’s so small, it seems like it would be easy to lose, but if you’re working with the CIA or some secretive company, carry it around.”]
Source: https://gizmodo.com/netac-technology-onlydisk-u220-worlds-smallest-secure-186726