Proste jsou tam nejake soubory a pak nahodna data (= volny prostor), ze je tam jeste schovany dalsi disk (hidden volume) vi jenom "majitel".
viz zde http://www.truecrypt.org/docs/?s=hidden-volume
The principle is that a TrueCrypt volume is created within another TrueCrypt volume (within the free space on the volume). Even when the outer volume is mounted, it is impossible to prove whether there is a hidden volume within it or not, because free space on any TrueCrypt volume is always filled with random data when the volume is created* and no part of the (dismounted) hidden volume can be distinguished from random data. Note that TrueCrypt does not modify the file system (information about free space, etc.) within the outer volume in any way.
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Karel Kuchařík: dostaneme se i do uzavřených sítí
