An optical disc includes an optical disc; a thermally conductive material disposed in a pattern of discrete pads on said disc; and a thermochromic material disposed over said pattern of thermally conductive material. A method of making an optical disc includes indenting a pattern onto an insulator; and...http://www.google.co.uk/patents/US7462383?utm_source=gb-gplus-sharePatent US7462383 - Labeling with thermally conductive pads
