Optical data storage medium and use of such medium

Details Optical data storage medium and use of such medium Optical data storage medium and use of such medium

2007-05-15

2007-05-15

Neyzari, Ali (Department: 2627)

Dynamic information storage or retrieval

Storage medium structure

Layered

C369S288000, C369S275100, C428S064400

Reexamination Certificate

active

10515683

ABSTRACT:
A multi-stack optical data storage medium (20) for rewritable recording using a focused radiation beam (30), entering through an entrance face (25) is described. The medium (20) has a substrate (1a, 1b) and an L0recording stack (2) and an L1recording stack (3) both comprising a phase-change type L0and L1recording layer and the recording stacks are separated by a transparent spacer layer (4). The L0recording stack (2) is present at a position closest to the entrance face (25) and has an optical transmission of TL0aand TL0cwhen the phase-change layer respectively is in the amorphous phase and in the crystalline phase. The medium (20) contains pre-recorded information modulated in at least one of: an embossed pregroove (21) in the substrate (1a, 1b), embossed pits in the substrate and recorded phase-change marks in at least one of the recording layers L0and L1(6, 11). The pre-recorded information contains a flag whether formatting of the L0recording layer of the L0recording stack (2) is needed depending on the transmission values TL0aand TL0cof the L0recording stack (2). In this way it is achieved that the medium (20) has a good playability, recordability and random access behavior even when the L0recording layer (2) has been partially recorded with information.

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