Patent ID: 7710854
Filing Date: 2010-05-04
Classification: G11B

Abstract:
1. An optical disc comprising a first substrate comprising a pre-recorded, first data storage layer and a second substrate comprising a recordable, second data storage layer, wherein the second substrate is affixed to the first substrate using an intervening bonding layer disposed between the first and second data storage layers to permit reading from the respective first and second data storage layers using a beam that passes through a common exterior surface of the disc, wherein the first data storage layer comprises first data stored in a first range of addressable blocks, wherein the second data storage layer comprises second data stored in a second range of addressable blocks, and wherein the first and second ranges successively increment over an overall range of addresses such that a readback system associated with the data transducing beam interprets the first data and the second data as being disposed on a common recording layer within said disc.