Willie, I think what you're using makes one big packet of all the data and folders and actually encrypts or locks the USB device. That isn't what I'm using. I use

http://www.kryptel.com/products/skey/?from=sk

Each file is encrypted, with a "decryption" program front-end so the recepient does not have to have any particular software to decrypt... just the password. IMHO this is not as platform-dependent as other methods.