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volume protection can be activated only by users who supply the correct password (and/or



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TrueCrypt User Guide

volume protection can be activated only by users who supply the correct password (and/or 
keyfiles) for the hidden volume (each time they mount the outer volume). 
 
As soon as a write operation to the hidden volume area is denied/prevented (to protect the hidden 
volume), the entire host volume (both the outer and the hidden volume) becomes write-protected 
until dismounted (the TrueCrypt driver reports the ‘invalid parameter’ error to the system upon each 
attempt to write data to the volume). This preserves plausible deniability (otherwise certain kinds of 
inconsistency within the file system could indicate that this volume has used hidden volume 
protection). When damage to hidden volume is prevented, a warning is displayed (provided that 
the TrueCrypt Background Task is enabled – see the chapter
 TrueCrypt Background Task
). 
Furthermore, the type of the mounted outer volume displayed in the main window changes to 

Outer(!)
’: 
 
Moreover, the field 
Hidden Volume Protected 
in the 
Volume Properties 
dialog window says:

Yes (damage prevented!)

.
Note that when damage to hidden volume is prevented, 
no
information about the event is written to 
the volume. When the outer volume is dismounted and mounted again, the volume properties will 
not 
display the string “
damage prevented
”.
 
 
 
 


42 
There are several ways to check that a hidden volume is being protected against damage: 
1. A confirmation message box saying that hidden volume is being protected is displayed after 
the outer volume is mounted (if it is not displayed, the hidden volume is not protected!). 
2. In the 
Volume Properties 
dialog, the field 
Hidden Volume Protected 
says ‘
Yes
’: 
3. The type of the mounted outer volume is 
Outer

 
 

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