It is true that you can be forced to hand over a decryption key to a machine in the UK through RIPA legislation. Nevertheless, I was suggesting this step as an additional layer of security to protect the contents of a USB on an otherwise clean operating system.I think it's important to be clear that while it's a worthy idea to install a hidden operating system using Truecrypt, doing so on a separate partition rather defeats the point of plausible deniability in encryption. You can (and should!) install a hidden OS to your main system partition while using full disk encryption. You can of course give the "safe" password to the authorities with no fear of recrimination.Update : I have just remembered from my heady days dabbling with computer forensics that the software Autopsy and its ilk will have you create an image of the suspect hard drive when analysing it, so even if you could construct a boot loader which could wipe the "hidden" partition I'm not sure if it would do much good. - Better encrypt the whole OS with Truecrypt and have a dual OS if that's the way you want things.V.Quote from: oscarzululondon on May 15, 2012, 04:29 pmQuote from: PermanentlySpun on May 15, 2012, 04:23 pm@vlad1m1r Could you point to where we could learn how to encypt an entire drive? Everything I"ve read about truecrypt just talks about encrypting specific folders. Also, there doesnt seem to be a reliable way to DoD wipe unused space without wiping entire drives. I see people mention this all the time on the forums, but when actually digging into it every tutorial just explains how to wipe entire drives.As I said above you don't want to TrueCrypt your entire drive. It's too obvious and can get you into trouble anyway, especially with new terrorism laws forcing you to hand over the key:http://yro.slashdot.org/story/12/01/24/024233/us-judge-rules-defendant-can-be-forced-to-decrypt-hard-driveWhat you want to do is TrueCrypt a small partition, which you install your 'naughty' operating system on, and then produce two keys. One key loads the partition normally for you, the other key loads a clean operating system and wipes the naughty one (3 pass eraze) which you can give to the police during interrogation. By the time they realize what's happened it's too late. You've not broken any laws, you've given them a legit key, and they have no evidence. BINGO 8)