Multilayer Optical Disk Recording Control for Defect Management
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Solution Overview
Problem
Multilayered optical disks face inefficiencies in data recording and management due to defective areas and the need for data rewriting, leading to decreased operating efficiency and reliability, especially when managing user data and management information across multiple layers.
Innovation Solution
A recording control device and method that irradiates laser light to a multilayered recording medium with sequential recording ranges for different purposes, using an alternate processing section to set the next writable address with the shortest distance as the alternate destination, ensuring efficient data recording and management by optimizing track placement and data distribution across layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data rewriting is performed by performing an alternate process when defective areas are detected, then data reliability is improved, but operating efficiency decreases when the same type of data is dispersed on recording areas
Solution Approach 1:
The recording medium is divided into multiple recording layers, each with sequential recording ranges for different recording purposes (user data, management information, mirror data). This segmentation allows systematic organization of data types across layers, enabling efficient alternate processing when defective areas are detected without dispersing the same data type across multiple locations.
Solution Approach 2:
Different recording purposes are assigned to specific sequential recording ranges on different layers. Management information is recorded on inner peripheral sides, user data on outer peripheral sides, and mirror data on front sides. This local quality assignment ensures that alternate processing for defective areas maintains data concentration and does not disperse the same data type across multiple locations, thereby preserving operating efficiency.
2Quantity of substance
If the number of recording layers is increased to achieve large storage capacity, then recording density is improved, but managing tracks and data distribution becomes more complex
Solution Approach 1:
Each recording layer is segmented into sequential recording ranges with distinct recording purposes. This segmentation provides a clear management framework for multilayered disks, organizing the complexity of track management through systematic categorization of data types across layers.
Solution Approach 2:
The sequential recording ranges are pre-defined with specific purposes (user data, management information, mirror data) before data recording begins. This preliminary organization eliminates the need for real-time complex decision-making during data distribution, simplifying track management while maintaining high storage capacity across multiple layers.
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
Improves operating efficiency and reliability by effectively managing data distribution and reducing the impact of defective areas, allowing for efficient data recording and reading across multiple layers without significant movement of the laser light, thus maintaining data integrity and reducing errors.
Implementation Method 1
a recording control section which controls data recording to a recording medium by irradiating laser light to the recording medium
Data Source
AI summary
Provided is a recording control device including a recording control section which controls data recording to a recording medium by irradiating laser light to the recording medium, and an alternate processing section which sets, in a case where recording of data to a specific address of a prescribed sequential recording range is instructed and an alternate process is generated, a next writable address having a shortest distance between a position of a next writable address and a position of the specific address from a center of the recording medium in an outer peripheral direction, from among next writable addresses of the sequential recording ranges of each of the recording layers, as an alternate destination of the specific address.