Version Information

System -> Mount Without Pre-Boot Authentication 
Check this option, if you need to mount a partition that is within the key scope of system encryption 
without pre-boot authentication. For example, if you need to mount a partition located on the 
encrypted system drive of another operating system that is not running. This can be useful e.g. 
when you need to back up or repair an operating system encrypted by TrueCrypt (from within 
another operating system).

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59 
Note 1: If you need to mount multiple partitions at once, click 
‘Auto-Mount Devices
’, then click 
‘
Mount Options
’ and enable the option ‘
Mount partition using system encryption without pre-boot 
authentication
’. 
Please note you cannot use this function to mount extended (logical) partitions that are located on 
an entirely encrypted system drive. 
Tools -> Clear Volume History 
Clears the list containing the file names (if file-hosted) and paths of the last twenty successfully 
mounted volumes. 
Tools -> Traveler Disk Setup 
See the chapter 
Portable Mode.
Tools -> Keyfile Generator 
See section 
Tools -> Keyfile Generator
 in the chapter 
Keyfiles. 
Tools -> Backup Volume Header 
Tools -> Restore Volume Header 
If the header of a TrueCrypt volume is damaged, the volume is, in most cases, impossible to 
mount. Therefore, each volume created by TrueCrypt 6.0 or later contains an embedded backup 
header, located at the end of the volume. For extra safety, you can also create external volume 
header backup files. To do so, click 
Select Device
or 
Select File
, select the volume, select 
Tools
-> 
Backup Volume Header
, and then follow the instructions. 
Note: A backup header (embedded or external) is 
not
a copy of the original volume header because it is 
encrypted with a different header key derived using a different salt (see the section 
Header Key Derivation, 
Salt, and Iteration Count
). When the volume password and/or keyfiles are changed, or when the header is 
restored from the embedded (or an external) header backup, both the volume header and the backup header 
(embedded in the volume) are re-encrypted with header keys derived using newly generated salts (the salt 
for the volume header is different from the salt for the backup header). Each salt is generated by the 
TrueCrypt random number generator (see the section 
Random Number Generator
). 
Both types of header backups (embedded and external) can be used to repair a damaged volume 
header. To do so, click 
Select Device
or 
Select File
, select the volume, select 
Tools
-> 
Restore 
Volume Header
, and then follow the instructions. 
WARNING: Restoring a volume header also restores the volume password that was valid when the 
backup was created. Moreover, if keyfile(s) are/is necessary to mount a volume when the backup 
is created, the same keyfile(s) will be necessary to mount the volume again after the volume 
header is restored. For more information, see the section 
Encryption Scheme
 in the chapter 
Technical Details
. 
After you create a volume header backup, you might need to create a new one only when you 
change the volume password and/or keyfiles. Otherwise, the volume header remains unmodified 

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60 
so the volume header backup remains up-to-date. 
Note: Apart from salt (which is a sequence of random numbers), external header backup files do not contain 
any unencrypted information and they cannot be decrypted without knowing the correct password and/or 
supplying the correct keyfile(s). For more information, see the chapter 
Technical Details
. 
 
When you create an external header backup, both the standard volume header and the area where 
a hidden volume header can be stored is backed up, even if there is no hidden volume within the 
volume (to preserve plausible deniability of hidden volumes). If there is no hidden volume within 
the volume, the area reserved for the hidden volume header in the backup file will be filled with 
random data (to preserve plausible deniability).
When 
restoring
a volume header, you need to choose the type of volume whose header you wish 
to restore (a standard or hidden volume). Only one volume header can be restored at a time. To 
restore both headers, you need to use the function twice (
Tools
-> 
Restore Volume Header
). You 
will need to enter the correct password (and/or to supply the correct keyfiles) that was/were valid 
when the volume header backup was created. The password (and/or keyfiles) will also 
automatically determine the type of the volume header to restore, i.e. standard or hidden (note that 
TrueCrypt determines the type through the process of trial and error). 
Note: If the user fails to supply the correct password (and/or keyfiles) twice in a row when trying to 
mount a volume, TrueCrypt will automatically try to mount the volume using the embedded backup 
header (in addition to trying to mount it using the primary header) each subsequent time that the 
user attempts to mount the volume (until he or she clicks 
Cancel
). If TrueCrypt fails to decrypt the 
primary header but it successfully decrypts the embedded backup header at the same time, the 
volume is mounted and the user is warned that the volume header is damaged (and informed as to 
how to repair it).