Re: Defeating Draconian laws
"Truecrypt or similar?"
Several of these packages put the hidden volume at the end of the disk, reading inwards, so a knowledgeable operator can detect the presence. Likewise when the filesystem reports a size substantially smaller than the physical drive's capacity.
The better solution for carrying sensitive information through hostile territory on a laptop or phone is "don't", when you can simply transmit it later.
Alternatively if you're not facing a strip search, 256GB of data fits on a microSD card and a few of those could be stuffed virtually anywhere (including Papillion's charger)