be able to unlock that volume. so for absolute security, you'd want to create a new volume that uses an entirely different master key.
2) the downside to having a password or phrase written down is that once its written down it is no longer protected by the fifth amendment (us). if you are arrested and the password only exists in your head, then you can't be forced to reveal it, however if it is written down they can try and find it using any legal method. an important fact now days in the current atmosphere.
...however if it is written down they can try and find it using any legal method. 