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Multi-level (ML) modulation recording technology increases the capacity of standard compact disc (CD) and digital versatile disc (DVD) rewritable systems without making changes to the optical/mechanical unit. In this paper, we introduce partial response maximum likelihood (PRML) technology to increase the accuracy of reading multi level signals from a ML-Run-length-limited (ML-RLL) recorded disc. Traditional slicer detection is no longer suitable for detecting multi-level run-length-limited signals. We also show several partial-response methods and their corresponding maximum-likelihood sequential estimation (MLSE) rules for ML-RLL modulation signal detection.

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