Expand TrueCrypt volume on Mac OS

You cannot expand it once it's created. Create a new volume of the size you now wish to have, mount both the old and new ones, and copy the files from the old volume to the new one. Then unmount the old volume and delete its file container.

This is possible if you have access to a win* box. Run extcv (from http://extcv.sourceforge.net) which will resize the TrueCrypt volume. Then you can use diskutil resizeVolume <vol_id> <size> on Mac OS to expand the filesystem.

This works great :) Here is a simple tutorial:

https://joet3ch.com/blog/2010/03/13/resize-truecrypt-volumes-on-mac-os/