I have bought a new HDD for installing a new operating system. Can I, in case I'm missing files, attach the old TrueCrypt-encrypted hard disk to USB and mount it in TrueCrypt?

Or doesn't this work for system-encrypted hard disks?

2 Answers 2


In the TrueCrypt GUI, choose the partion of the external drive, then select "Mount without Pre-Boot authentication" from the Tools menu.

This will let you mount the volume as if it were an encrypted device without the boot loader (the difference just being a few offsets as to where TrueCrypt should attempt to decrypt the volume header from)

  • 1
    I took a copy of an encrypted partition onto a USB drive using Knoppix and using the dd tool to byte-copy the partition. Later, back in Windows, the TrueCrypt GUI + Mount without pre-boot authentication option doesn't successfully mount the USB partition..
    – PP.
    Nov 21, 2009 at 13:09
  • In the 'Mount without pre-boot authentication option'-window the keyboard is changed to default/native (?), so if you use dvorak you might find yourself with a qwerty layout. I belief Truecrypt switches to the bios-level keyboard layout.
    – arberg
    Jan 1, 2015 at 14:21

I don't think the system encryption feature of TrueCrypt binds to the other hardware.
You should be able to use the encrypted disk on other systems.

You will need the TrueCrypt boot loader engaged in the boot process to unlock the system encryption on that drive. The TrueCrypt Rescue Disk might be useful for this.

However, there is always the option of booting from that drive and removing encryption (which works in place) before using it this way -- could take some time depending on the drive size.

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