Public bug reported:
I am running Ubuntu 8.04 with all of the latest patches. The system is
set up using the LVM and the drive the system is running off of is
encrypted. I have an external 500 GB USB drive (465 GB of usable
space). I have attempted to format it with the "Hidden Volume" option.
The results I get are strange and probably a bug. Here are the results:
First, I choose to "create a volume within a partition/device", then a
"hidden truecrypt volume". I select the encryption algorithm (I have
tried AES-Twofish-Serpent, Serpent-Twofish-AES, and just AES with the
same results) and hash algorithm "Whirlpool". I let the program format
the drive. 12 hours later, I am asked to copy some files to the outer
volume. I copy one small 10 kilobyte file (because the program makes me
copy something, personally I don't see why it is necessary as my intent
is to divide the disk up into two relatively equal parts for the outer
verses hidden volumes).
Next, the program calculates the largest possible hidden volume size.
Here is where things get strange. It always tells me the largest
possible size for the hidden volume is about 47.5 GB. This is on a 465
GB disk with one small 10 k file copied to it. Since I am trying to
make about a 200 GB hidden volume, I go ahead and say I want a 45 GB
hidden partition. The program finishes its work and I then start
copying lots of files to the outer volume. I can copy about 2 GB of
files before the program disables copying to the outer volume in order
to protect the hidden volume.
In other words, when creating a hidden volume of size 45 GB on a 465 GB
drive, I only get 47.5 GB of usable space for the whole drive, including
both the hidden volume and the outer volume. I have not tried to copy
files to the hidden volume to see how much it would actually let me
copy. I suspect that the 45 GB that I am typing in as the size for my
hidden volume is actually being set up as something much much larger.
When I create just a standard truecrypt volume (no hidden volume), the
drive is set up with the full 465 GB of space available.
** Affects: ubuntu
Importance: Undecided
Status: New
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Truecrypt hidden volume size incorrect
https://bugs.launchpad.net/bugs/252939
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