Yes, but you can just carry encrypted hard drive with you. Hiding encrypted data is useful pretty much only for legal reasons. You want to take it across border and are worried TSA agent will force you to decrypt it or something. What is safer in that case? Carrying a USB stick with hidden encrypted partition or not carrying anything at all and downloading the data later? I would say the latter. Smuggling encrypted data through custom checks into a war zone with limited internet access is the cool but unlikely spy games scenario I was talking about. Encrypted microSD card would be even more secure in that case.