I like using the Apricorn keypad flash drives. Like this Lenovo, it's doesn't connect until you unlock it. Password entry is via the built-in keypad so no software is necessary. It's also got a small battery so you can unlock it before you plug it which could prevent someone sniffing the USB 5V rail for any noise. Needing an app makes the Ironkey useless for anything that isn't running a normal desktop OS.