[dba-SQLServer] True Crypt whole disk encryption

Mark Breen marklbreen at gmail.com
Mon Oct 3 04:37:32 CDT 2011


Hi John,

I used True Crypt last year for an External Disk and it seemed to work well.

I read in the docs that it does not / cannot slow the machine down even by
less than 1%.  They actually said it as a 0% performance hit.

Do you know how / why that is ?
thanks
Mark


On 1 October 2011 21:13, jwcolby <jwcolby at colbyconsulting.com> wrote:

> The last iteration with my laptop I used Windows Bit locker to perform a
> whole disk encryption. This time I am using Windows 7 Home Premium which
> does not include Bit locker.  I had just about decided to use True Crypt
> anyway because with Bil Locker I was unable to mount the old hard disk on
> another computer to pull the old contents off onto the new disk.
>
> So when I installed Windows 7 I broke the disk into three partitions, a 6
> gig for the swap file, 100 gig for the OS/programs and 400 gig for data.  I
> then started Truecrypt and told it to go to work encrypting the whole thing
> and went to bed.  In the morning... the computer had decided to sleep during
> the night (lazy thing!) and so it was only 25% finished.
>
> It took most of the day to finish encrypting the entire disk (all
> partitions) and so here I am.
>
> Having done that I decided to hang the truecrypt encrypted disk on another
> computer, put the old disk back in and push the disk contents out to the
> other disk.
>
> The other disk would not finish loading Windows with the truecrypt
> encrypted disk on it!  It would start to load Windows (2008 server) and then
> apparently it ran into the true crypt disk and couldn't handle it.  It just
> hung, never finished loading windows.
>
> In the end I told the bitlocker software to unencrypt the old disk, then
> hung that on another machine and put the truecrypt disk back in the laptop,
> and pulled everything into the new disk. Well not everything but you know
> what I mean.  At least I can do that with the unencrypted disk drive.
>
> Things never work the way I envision them working.
>
> Truecrypt is not significantly slowing down the new disk.  I do have to
> enter the password at the point where the bios tries to load windows, then
> off it goes.  Not good for auto reboot after software updates...
>
> --
> John W. Colby
> Colby Consulting
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