Re: "Is this what you wanted to see?"
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I remember TrueCrypt had something similar with hidden volumes but it all takes space and is detectable if you're looking for it
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Yes, it takes a little space - but it certainly cannot be detected however hard you look. At most you might find signs that increase *suspicion* that a hidden volume exists, but nothing that can *prove* (even on balance of probability) that it really does exist.