Dual-stack optical data storage medium and use of such medium

00 L0 L0 1 1 L1 L1 L1minminL0min A dual-stack recordable optical data storage medium wherein a focused radiation beam having a wavelength λ enters through an entrance face of the medium during recording. The medium includes a substrate, a first recording stack L, including a recording layer, the fir...

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Bibliographic Details
Main Authors Martens, Hubert Cécile François, Tieke, Benno
Format Patent
LanguageEnglish
Published 13.10.2009
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Summary:00 L0 L0 1 1 L1 L1 L1minminL0min A dual-stack recordable optical data storage medium wherein a focused radiation beam having a wavelength λ enters through an entrance face of the medium during recording. The medium includes a substrate, a first recording stack L, including a recording layer, the first recording stack Lhaving an optical reflection value Rand an optical absorption value Aat the wavelength λ, and a second recording stack Lincluding a recording layer, the second recording stack Lhaving an optical reflection value Rand an optical absorption value Aat the wavelength λ, and a transparent spacer layer between the recording stacks. The second stack is closer to the entrance face than the first stack. By fulfilling the formula AR−√(R/R), where Ris the minimum effective optical reflection value for each recording stack, full compatibility is achieved with a read only version of the medium.