Multilayer Disc Recording Management with Fixed UDF Track
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Solution Overview
Problem
Multilayer optical discs face challenges in managing tracks for user data and management information, leading to reduced operation performance and reliability due to interference between layers and inefficient recording operations.
Innovation Solution
A recording management apparatus and method that sets a fixed management information track conforming to UDF standards on the front-most layer, allowing for flexible recording of AVDP and other management information, enabling rewriting on the same layer and improving reliability and performance by using sparing processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If management information is recorded in a fixed position on the front-most layer, then UDF compliance is achieved, but recording flexibility and operation performance deteriorate due to layer interference
Solution Approach 1:
The patent divides the management information storage into two separate segments: a fixed position on the front-most layer for UDF compliance, and a flexible spare area on the same or different layers for actual recording operations. This segmentation allows the system to maintain both UDF compliance and operational flexibility simultaneously.
Solution Approach 2:
The patent introduces an intermediary mechanism (the closing track processing and spare area) that mediates between the fixed position requirement and the flexible recording need. The fixed position serves as a pointer or reference, while the actual management information is recorded in the flexible spare area, allowing both requirements to coexist.
2Reliability
If the fixed management information track is closed immediately after setting, then recording reliability is improved, but writing flexibility is reduced
Solution Approach 1:
The patent performs preliminary action by closing the fixed management information track immediately after setting, establishing a reliable fixed position before any recording operations. This preliminary closing ensures the track is protected from accidental overwriting while maintaining the ability to write management information in the associated spare area.
Solution Approach 2:
The patent resolves the contradiction by moving the writing flexibility to another dimension - instead of allowing flexible writing in the fixed track itself, the system provides a corresponding spare area in the same or different layers where flexible writing can occur, while the fixed track remains closed and protected.
3Quantity of substance
If multiple layers are used for recording, then storage capacity increases, but layer interference causes recording errors
Solution Approach 1:
The patent extracts the management information recording function from the data recording layers and places it in a dedicated fixed position on the front-most layer. This extraction separates the management information recording path from the data recording path, reducing interference between layers while maintaining multilayer storage capacity.
Solution Approach 2:
The patent provides beforehand cushioning by creating spare areas in the same or different layers corresponding to the fixed management information track. These spare areas serve as buffer zones that absorb potential interference effects, ensuring that even if layer interference occurs, the management information can be reliably recorded in the protected fixed position or its spare counterpart.
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
Enhances the reliability and operation performance of recording systems by allowing flexible management information recording and rewriting on multilayer discs, reducing interference between layers and optimizing track management.
Implementation Method 1
a recording medium having a plurality of layers serving as recording layers where recording of information is performed by laser irradiation
Implementation Method 2
recording or playing of signals is performed by irradiation of light
Data Source
AI summary
A recording management apparatus includes: a control unit configured to perform track setting processing arranged to set a fixed management information track where management information to be fixedly disposed with a data structure conforming to the UDF, in a layer on the front-most side as viewed from a laser entry face side, to a recording medium having a plurality of layers serving as recording layers where recording of information is performed by laser irradiation on which a track serving as a continuous recording area is formed in which recording of data is performed, closing track processing arranged to set the fixed management information track to a consecutive recording completed state immediately after setting, and writing request processing arranged to record, by performing management information writing request for the fixed management track which has been closed, management information relating to this writing request in another track by sparing processing.