Dual-Layer Optical Disc Finalize Time Reduction
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Solution Overview
Problem
In two-layer type optical discs, the finalize process is time-consuming due to the need to record dummy data in the second recording layer after completing data recording in the first layer, especially when using existing CD-ROM players.
Innovation Solution
An information recording medium with a first and second recording layer, where management information is recorded in a management information recording area, allowing for efficient layer switching and reducing the need for dummy data by equalizing the recording areas in both layers, enabling quick finalize processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If data is recorded in the entire L0 layer before recording in the L1 layer, then the recording process is simple and sequential, but the finalize process time increases due to the need to record dummy data in the L1 layer
Solution Approach 1:
The patent applies preliminary action by recording management information (RMD) in the L1 layer during the initial recording phase, before the finalize process. This RMD contains zone information that allows the reproduce apparatus to identify which areas in the L1 layer contain valid data and which areas should be treated as dummy data, thereby eliminating the need to physically record dummy data during finalization.
Solution Approach 2:
The patent introduces management information (RMD) as an intermediary element that mediates between the recording process and the finalize process. This RMD acts as a metadata layer that provides instructions to the reproduce apparatus on how to interpret the L1 layer structure, allowing the system to distinguish between recorded data areas and dummy data areas without physical dummy data recording.
2Reliability
If dummy data is recorded in the L1 layer to match the L0 layer size, then the finalize process is complete, but the time required exceeds the actual data recording time
Solution Approach 1:
The patent extracts the dummy data recording function from the finalize process by using management information (RMD) to identify and mark dummy data areas during the initial recording phase. This extraction allows the finalize process to focus only on essential finalization tasks rather than spending time physically recording dummy data that can be logically identified through RMD.
Solution Approach 2:
The patent uses management information (RMD) as a copy or representation of the actual data distribution map. Instead of physically recording dummy data to match L0 layer size, the RMD creates a logical copy of the data layout information that allows the reproduce apparatus to understand the L1 layer structure without requiring physical dummy data filling.
3Quantity of substance
If the L1 layer recording area is smaller than the L0 layer, then less data is recorded overall, but dummy data must be added to match sizes, increasing finalize time
Solution Approach 1:
The patent applies preliminary action by recording management information (RMD) that maps the actual data areas in the L1 layer during the recording phase. This RMD is recorded in advance and contains zone information that identifies where valid data ends and dummy data begins, allowing the system to handle size mismatches between L0 and L1 layers without requiring time-consuming dummy data recording during finalization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces the finalize process time to match the time required for recording effective data, enhancing user convenience by minimizing unnecessary recording time.
Implementation Method 1
the information is recorded into the L0 layer in a rewritable method or irreversible change recording method by irreversible change recording heat by using heat or the like, by focusing the laser light for recording onto the L0 layer
Data Source
AI summary
Disclosed is an information recording medium (100) comprising a first recording layer (L0 layer) which is provided with a first recording track for recording record information, and a second recording layer (L1 layer) which is provided with a second recording track for recording record information. Each recording zone (zone #n) including one recording area in the first recording layer and another recording area in the second recording layer which is opposite to the recording area in the first recording layer has a management information recording area (RMA) for recording management information (RMD) for recording the record information.