Optical Disc Data Recording Area Segmentation for Format Efficiency
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Solution Overview
Problem
In dual-layer type optical discs, the repeated data recording and format processes lead to inefficiencies due to the loss of management information, making it difficult to identify recorded areas and necessitate redundant format processes, which increase processing time and complicate compatibility with read-only devices.
Innovation Solution
An information recording medium and apparatus that utilize a data recording area with segmentized attributes and an address recording area to efficiently track the edge portions of continuous recording areas, allowing for reduced format processing time by identifying already recorded data areas and omitting unnecessary format processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If repeated data recording and format processes are performed on dual-layer optical discs, then data can be overwritten and reorganized, but management information is lost making it difficult to identify recorded areas
Solution Approach 1:
The patent segments the data recording area into multiple attribute areas (first attribute area, second attribute area, third attribute area) with different attributes. This segmentation allows the system to track and manage different states of recording areas independently, preserving management information even after repeated format processes. Each attribute area maintains its identity and attributes, enabling the reproducing apparatus to identify recorded areas without losing management information.
2Adaptability or versatility
If format processes are performed to maintain compatibility with read-only devices, then compatibility is improved, but processing time increases
Solution Approach 1:
The patent applies partial action by performing format processes only on specific attribute areas rather than the entire disc. The reproducing apparatus identifies which attribute areas require formatting based on their attributes and the compatibility requirements, and performs format processes only on those specific areas. This partial approach maintains compatibility with read-only devices when needed while significantly reducing processing time compared to full disc formatting.
3Adaptability or versatility
If the entire L1 layer is recorded to provide compatibility with read-only devices, then compatibility is improved, but recording time and storage capacity are reduced
Solution Approach 1:
The patent applies local quality by assigning different attributes to different areas of the L1 layer based on their specific functions and compatibility requirements. Rather than uniformly recording the entire L1 layer, the system identifies specific attribute areas that require recording for compatibility and performs recording only on those local areas. This approach maintains necessary compatibility while preserving recording efficiency and available storage capacity.
4Reliability
If redundant format processes are performed to ensure compatibility, then compatibility is maintained, but processing complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where the reproducing apparatus reads attribute information from the disc, determines compatibility requirements, and selectively performs format processes on specific attribute areas. This feedback-driven approach ensures compatibility is maintained through targeted format processes rather than redundant full-disc formatting, reducing processing complexity while maintaining reliability.
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 enables efficient format processing by clearly distinguishing recorded areas from unrecorded ones, reducing processing time and ensuring compatibility with read-only devices by maintaining accurate management information.
Implementation Method 1
focuses a laser beam for recording on a recording layer located on the front side (i.e. on the closer side to an optical pickup) viewed from the irradiation side of the laser beam (referred to as a 'L0 layer' as occasion demands in the application), to thereby record data into the L0 layer in a heat change recording method
Data Source
AI summary
An information recording medium (100) is provided with: a data recording area (105, 115) to which one attribute, which corresponds to recorded data, of a plurality of types of attributes is given in each of segmentized area units; and an address recording area (1031, 1032) to record therein an address (AD0-1, AD1-1) of an edge portion on an outermost side of a recording area, which is a continuous recording area to which a data area attribute of the plurality of types of attributes is given and which is a recording area closest to an edge portion on an innermost side of said data recording area, the data area attribute indicating a status that user data is recorded as the data.