@track: Of course computer files are usually not random data. But if you want to securely erase a hard disk (perhaps before selling it on ebay), you can just write random data to it.
So a hard disk full of random data could just be that.
And about search warrants: judges tend to be very generous when signing them. I recently read about someone's flat being searched because he was accused of having used someone else's account to pay on a porn site. While this is certainly not something to be taken lightly, the evidence was not clear (the guy in fact _was_ innocent). Actually the attorney of the state had no clue about computers, as had the judge. They filled the search warrant. And all for about 50 euros (~60$)! So don't place a bet on a judge to protect your rights as a citizen.
You quoted Future Shock and said that he is 100% correct.
My point is: you _cannot_ conmpare a door to an encrypted disc. Cause there is no such thing as an impenetrable door. The door is there, they have a search warrant, they can ask(! not force!) you to open it, or they will open it for you, certainly leaving quite a mess. But how can they force you to reveal a password. Perhaps you forgot it. Of course, that is a lie, but what should they do? Put you in jail 'til you remember? For what, perhaps because of some hundred MP3 or warez? While RIAA and other lobby organisations would like to have jail sentences for that, the relation between the severity of the crime and the punishment should not be forgotten.
Currently there is a development in many countries, caused by serios lobbying of the entertainment industry, to put severe punishment (even prison sentences) for non-commerical violation of copyrights. I say that here the balance between punishment and "crime" is no longer kept. I mean, five years of prison is less than a rapist usually gets! It can't be that you are (punishment-wise) better of when you rob your local CD store than when you download the MP3s them from the internet.
And even for the most severe crimes, there are measures that simply MAY NOT be taken under any circumstances in a country that calls itself civilized and democratic. Torture, locking up people without giving them proper legal support etc.
The problem ist, that if the apparent crime is severe enough, many people will happily agree to do whatever necessary to make someone speak.
Should someone be tortured if national security is at stake (just think about the "24" TV-series, where Jack Bauer kills and tortures non-stop, and most viewers think that's okay)? Maybe.
Should someone be tortured/locked up because he _may_ have some warez on an encrypted disk? - Definitely not.
But since "we have the best politicians money can buy", we might soon see laws that allow just that. Perhaps that is the time to consider leaving a country (but go where?), not only because such a law might one day be applied to oneself, but because the fact that such a law was ever adopted shows that a country is no longer "free" or a constitutional state.
Leaving a country because of questionable laws might seem extreme at first, but consider what many germans (especially those of yewish origin) did during the 1930s. They saw to what the political developments were leading to, and left the country. But unlike in the 1930s there might not be a "save haven" to go to.