No, Mr. Obio, whom I love and respect as a human being, is incorrect. The SCOTUS has made no such determination, but the confusion is understandable.
The idea of "contents of his own mind" does indeed appear in a safe case (John D. v. United States -- 1988) in which a defendant was compelled to provide combinations of safes protecting various records. The defendant claimed this violated his 5th amendment rights, and after some time SCOTUS agree to review. Essentially SCOTUS held up the conviction with a very clear majority. The dissenting opinion was written by Justice Stevens, who asserted that "He may in some cases be forced to surrender a key to a strongbox containing incriminating documents, but I do not believe he can be compelled to reveal the combination to his wall safe —- by word or deed". Interesting, because the Justice seems to indicate that if you have a key lock you can be compelled, but not if it's a combination lock....okay, that's pretty odd, but not germane to our discussion.
Regardless of the dissenting opinion, the court ruled you gotta hand it over....that's not been overturned, it still stands as the law of the land. The confusion comes in a subsequent case.
Remembering that dissenting opinions are important SCOTUS cites this dissent in a review of a Grand Jury Subpeona (U.S. v. Hubbell--2000) coming out of the Whitewater investigation. Please note the wording...."It was unquestionably necessary for respondent to make extensive use of “the contents of his own mind” in identifying the hundreds of documents responsive to the requests in the subpoena. … The assembly of those documents was like telling an inquisitor the combination to a wall safe, not like being forced to surrender the key to a strongbox." This is the citation Mr. Obio is making reference to, however, this is only part of the story. Note that SCOTUS is using the safe as an example to make a point. This is known as a "Dicta" which is simply the musings of the court in an attempt to explain an issue. It has no legal binding and sets no precedence. So, first case set the precedence, second case fails to overturn that precedence (the case actually revolved around the assembly and categorization of several thousand documents, which Hubbell was required to assemble, sort, and produce to his detriment which is where the "reference to his own mind" comes in-- let us not weep for Hubbell or his mind however, the Feds had him dead to rights on other charges, and he copped a plea).
Subsequent to both these cases, in 2009 the Federal Review Court in Vermont overturned a lower court that had determined compelling an accused person to provide an encryption password to a computer as part of a lawful search was a violation of their 5th Amendment rights (re Bucher). The U.S. case was that the encryption password itself was immaterial, it was the contents of the computer that was important. The Review Court agreed and that ruling stands.
So, at this point in time SCOTUS has established that you may be compelled to produce a combination to a safe. You may also be compelled to decrypt a HDD according to the last Federal Review case involving this issue. Our accused must provide access to the drive IAW current law. Her rights have not been violated.
Next?