Embodiments of the invention relate to methods and apparatus useful in the nanopatterning of rotationally symmetric disk materials, like magnetic and optical disks, where a rotatable mask is used to image a radiation-sensitive material. Typically the rotatable mask comprises a cone. The nanopatterning...http://www.google.com/patents/US8182982?utm_source=gb-gplus-sharePatent US8182982 - Method and device for patterning a disk
