by version until 5.1a truecypt was able to creat a truely hide volume. and this is gone with version 6! by v5.1a, you can create a hiden volume in a partition ,and than quik format the partition in FAT32, and the hiden volume is still can be used. the advantage of this is no one will expect that in a FAT32 partition, and even with some files on it, is a truecrypt volume. and if they use tools like winhex to exame the drive, we can easly say, the empty space was erased with ramdon passes. and no one could proved it otherwise. the v6 changed the header place of the hiden volume, so it is not posible to do so anymore. by the version 5, truecypt place the header of the hiden volume in the end of the partition. but in the version 6, they placed it in the front of the partition, just behind the header of the outer volume, and this cause the failure. http://www.truecrypt.org/images/docs/hidden-volume.gif i like to sugest the devloper change it back again, think about you will able to have a hiden windows in the second FAT32 partition, and decrypt the deco OS, so you have a truely hiden OS, which is only bootable with your rescue Disk, and has the full deniability.