Optical Disk Access Control Area for Cross-Standard Compatibility
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Solution Overview
Problem
Existing optical disk systems face compatibility issues due to the addition of new functions, as older standards may not recognize or operate with newer disks that have additional features, leading to potential recording and reproducing problems when different standards are used.
Innovation Solution
An information storage medium with an assigned access control area that includes specific and common information, allowing recording/reproducing apparatuses to recognize and utilize new functions, even if they do not understand the specific function, by setting access control data such as write protection or read protection states, ensuring compatibility across different standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If new functions are added to the optical disk standard, then the functionality and versatility of the new standard are improved, but compatibility with older drive systems that cannot recognize these new functions deteriorates
Solution Approach 1:
The access control data is segmented into two distinct parts: specific information (related to new functions) and common information (related to basic functions). This segmentation allows old drive systems to access and use the common information while ignoring the specific information they cannot recognize, thereby maintaining compatibility while enabling new functionality.
Solution Approach 2:
The access control data structure is designed to serve multiple functions simultaneously: it provides access control for both old and new standards, supports both specific new functions and common basic functions, and enables backward compatibility while forward-looking. This universal structure resolves the contradiction between new functionality and old compatibility.
2Adaptability or versatility
If access control data includes only specific information about new functions, then the new standard can fully utilize new functions, but older drive systems cannot operate the disk at all
Solution Approach 1:
The access control data is designed with a universal structure containing both specific information (for new functions) and common information (for basic functions). This allows the same access control data to be operable by both new drive systems (which can use all information) and old drive systems (which can use the common information), thereby ensuring ease of operation across different standards.
3Ease of operation
If the access control data structure is simplified for compatibility, then ease of operation in old systems is improved, but the ability to support new functions deteriorates
Solution Approach 1:
The access control data is divided into specific information (for new functions) and common information (for basic functions). The common information portion maintains simplicity for compatibility with old systems, while the specific information portion enables new functionality. This segmentation resolves the contradiction by allowing both simplicity and complexity to coexist in different parts of the same data structure.
Data Source
AI summary
An information storage medium and a recording/reproducing apparatus and method, the information storage medium includes: an area for recording information regarding a predetermined function applied thereto, wherein the information regarding the predetermined function includes specific information in which set information regarding the predetermined function is set by a recording/reproducing apparatus that can recognize the predetermined function, and common information set by the recording/reproducing apparatus that can recognize the predetermined function based on corresponding information dependent upon the set information so that a recording/reproducing apparatus that cannot recognize the predetermined function can use the predetermined function. Accordingly, a recording/reproducing apparatus that cannot recognize a predetermined function can properly use a medium having the predetermined function.