Patent ID: 8084168

Claim:
A data storage device comprising: a substrate having oppositely disposed first and second surfaces; a plurality of data volumes arranged in a data layer between the surfaces and along tracks in the data layer; a plurality of micro-holograms each contained in a corresponding one of the data volumes; a plurality of complementary volumes arranged in a complementary layer between the surfaces, wherein the complementary layer is adjacent to the data layer and wherein each of the complementary volumes is substantially aligned with one of the data volumes; a plurality of micro-holograms each contained in a corresponding one of the complementary volumes; wherein, the presence or absence of a micro-hologram in each of the data volumes and the complementary volumes is indicative of a corresponding portion of data stored; and, wherein the data volumes which each contains a micro-hologram is substantially aligned to a complementary volume which does not contain a micro-hologram; and wherein the data volumes which do not contain a micro-hologram are each substantially aligned to a complementary volume which contains a micro-hologram.