Operation Manual

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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 VeraCrypt 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
VeraCrypt Background Task is enabled – see the chapter VeraCrypt 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”.