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Important: When an adversary asks you to mount an outer volume, you, of course, must not 
mount the outer volume with the hidden volume protection enabled. You must mount it as a 
normal volume (and then TrueCrypt will not show the volume type "Outer" but "Normal"). 
Note that during the time when an outer volume is mounted with the hidden volume 
protection enabled, the adversary can find out that a hidden volume exists within the outer 
volume (he/she will be able to find it out until the volume is dismounted). 
 
Warning: Note that the option ‘Protect hidden volume against damage caused by writing to outer 
volume’ in the Mount Options dialog window is automatically disabled after a mount attempt is 
completed, no matter whether it is successful or not (all hidden volumes that are already being 
protected will, of course, continue to be protected). Therefore, you need to check that option each 
time you attempt to mount the outer volume (if you wish the hidden volume to be protected): 

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If you want to mount an outer volume and protect a hidden volume within using cached passwords, 
then follow these steps: Hold down the Control (Ctrl) key when clicking Mount (or select Mount with 
Options from the Volumes menu). This will open the Mount Options dialog. Enable the option 
‘Protect hidden volume against damage caused by writing to outer volume’ and leave the password 
box empty. Then click OK.
If you need to mount an outer volume and you know that you will not need to save any data to it, 
then the most comfortable way of protecting the hidden volume against damage is mounting the 
outer volume as read-only (see the section Mount Options).