Optical data storage medium and use of such medium

• Main Authors: Woerlee, Pierre Hermanus, Koppers, Wilhelmus Robert, Vlutters, Ruud, Yin, Bin, Drenten, Ronald Reindert
• Format: Patent
• Language: English
• Published: 15.05.2007

aba c aba c A multi-stack optical data storage medium for rewritable recording using a focused radiation beam, entering through an entrance face is described. The medium has a substrate and an L recording stack and an L recording stack both comprising a phase-change type L and L recording layer and the recording stacks are separated by a transparent spacer layer. The L recording stack is present at a position closest to the entrance face and has an optical transmission of TLand TLwhen the phase-change layer respectively is in the amorphous phase and in the crystalline phase. The medium contains pre-recorded information modulated in at least one of: an embossed pregroove in the substrate, embossed pits in the substrate and recorded phase-change marks in at least one of the recording layers L and L. The pre-recorded information contains a flag whether formatting of the L recording layer of the L recording stack is needed depending on the transmission values TLand TLof the L recording stack. In this way it is achieved that the medium has a good playability, recordability and random access behavior even when the L recording layer has been partially recorded with information.