Optical Disc Finalization Position Tracking
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Solution Overview
Problem
The finalizing process and bordered-area closing steps on multi-layer rewritable optical discs are time-consuming, particularly due to the lengthy process of recording padding data on unused portions and managing recording management information across multiple layers.
Innovation Solution
A method and apparatus that calculate and update on-disc positions to identify unused regions between data-recorded regions on multiple layers, record padding data to finalize or close bordered areas, and update recording management information to optimize disc formatting and playback compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If padding data is recorded on unused portions of multi-layer optical disc to finalize the disc or close bordered areas, then disc finalization and bordered-area closing can be completed, but the process takes a relatively long time
Solution Approach 1:
The patent applies preliminary action by pre-calculating the innermost position of the data-recorded region in the second recording layer before the finalization process. This allows the system to identify unused portions and prepare padding data recording in advance, significantly reducing the actual finalization time while ensuring complete disc finalization.
Solution Approach 2:
The patent implements self-service by having the recording apparatus automatically manage the identification of unused portions and the recording of padding data without requiring external intervention. The system uses its own recording management information to determine where padding is needed and executes the padding recording autonomously, improving efficiency.
2Measurement precision
If recording management information is updated across multiple layers to track data-recorded regions, then accurate disc management is achieved, but the complexity of the finalizing process increases
Solution Approach 1:
The patent applies segmentation by dividing the multi-layer disc into distinct recording layers with separate recording management information for each layer. This allows the system to track the innermost position of data-recorded regions in the second layer and the outermost position in the first layer independently, achieving precise position tracking while managing complexity through structured organization.
Solution Approach 2:
The patent uses another dimension by utilizing the vertical layering of the optical disc to store additional position information. By recording the innermost position in the second layer and comparing it with the outermost position in the first layer, the system creates a multi-dimensional tracking system that improves measurement precision without proportionally increasing process complexity.
Data Source
AI summary
A first data-recorded region is formed in one of multiple recording layers of a rewritable optical disc before a second data-recorded region is formed therein. A first on-disc position is related to an innermost position within the second data-recorded region. Information is reproduced from a recording management area of the disc. A second on-disc position is derived from the reproduced information. The second on-disc position is in substantial coincidence with an outermost position within the first data-recorded region. The first on-disc position and the second on-disc position are compared to decide whether an unused portion is present in or absent from a region therebetween. When the unused portion is present, padding data is recorded thereon. The second on-disc position is updated into substantial coincidence with an outermost position within the second data-recorded region. The information in the recording management area is updated to reflect the updated second on-disc position.