I have never liked the removable secret drive type of computer because it makes it too easy to commit these types of criminal acts. I prefer those computers to be contained within a secure facility. None of this discussion, however would affect the TS/SCI/SAP data that was found on Clinton's email. The presence of that data indicates a complete compromise of the DoS handling of that level of data. If DoS cannot explain how that data got out of its physical safeguards the other departments should stop sharing that level of information with State. That should include having some other organization take over their management of TS/SCI/SAP for some period of time until State demonstrates the ability to manage their own security program.
It is scary that SAP and SCI data can be handled so carelessly. That is how info get leaked to the enemy and people, like ambassadors, get killed.
Excellent analysis!