Question 1: Is the Toshiba Canvio Advance (4TB) only compatible with USB 3.0 or also backwards compatible (with USB 2.0 and USB 1.0)? Question 2: Why are there price differences for the different colours (black: Fr. 98.10 / blue + white: Fr. 98.-- / red: Fr. 95.70 Question 3: Is there a hard case for the Toshiba Canvio Advance (4TB) ?