TrueCrypt - Free Open-Source On-The-Fly Disk Encryption Software for Windows Vista/XP, Mac OS X and Linux - Documentation

A hidden operating system is a system (for example, Windows Vista or Windows XP) that is installed in a hidden TrueCrypt volume. It is impossible to prove that a hidden TrueCrypt volume exists (provided that certain guidelines are followed; for more information, see the section Hidden Volume) and, therefore, it is impossible to prove that a hidden operating system exists.

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