When it comes to moving data around, while a USB flash drive is hard to beat for convenience, when it comes to capacity, a hard drive is what gets the job done. A full drive of data out in "the wild" should make you nervous, and if the data is sensitive, then the Aegis Padlock Fortress is the tool to keep it secure. This is a drive designed specifically to keep data secure for applications including the military, government, and healthcare.
The encryption on the Aegis Padlock Fortress is top notch. It is FIPS 140-2 certified. To achieve this level of certification requires that is has military grade AES-XTS 256-bit hardware encryption. The XTS is a newer algorithm, that reportedly uses 2 cipher keys simultaneously, to provide a greater level of security than other algorithms.