Disc Management Information Recovery Controller
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for recovering disc management information on optical discs, such as Blu-ray discs, are inefficient, particularly when inconsistency flags indicate unreliable data, requiring the reading of entire clusters, which is time-consuming.
Innovation Solution
A controller and method that utilize a pickup head to search for readable temporary disc management areas, determine detection conditions based on remaining readable information, and perform targeted updates to recover unreliable disc management information, avoiding the need to read the entire user data area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods read all clusters to recover disc management information, then reliability of recovered information is ensured, but recovery time increases significantly
Solution Approach 1:
The patent segments the disc into multiple areas (defect list area, sequential recording range area, random access area) and selectively scans only relevant segments based on inconsistency flags, rather than reading all clusters. This segmentation allows the system to focus recovery efforts on specific areas where inconsistencies are detected, reducing overall recovery time while maintaining reliability.
Solution Approach 2:
The patent implements partial action by performing selective scanning of only those disc areas indicated by inconsistency flags in the temporary disc management structure. Instead of exhaustively reading all clusters, the system performs partial scans targeted at specific regions, achieving sufficient reliability for recovery without the excessive time cost of complete disc scans.
2Measurement precision
If the system performs comprehensive scanning to ensure accurate recovery, then measurement precision improves, but productivity decreases
Solution Approach 1:
The patent performs preliminary action by first checking inconsistency flags in the temporary disc management structure before initiating any scanning operations. This preliminary check identifies which specific areas of the disc may contain inconsistencies, allowing the system to prepare targeted scan parameters and avoid unnecessary scanning of unaffected areas, thereby improving both accuracy and efficiency.
Solution Approach 2:
The patent divides the disc into functional segments (defect list, sequential recording ranges, random access areas) and applies different scanning strategies to each segment based on the inconsistency flags. This segmentation enables precise detection in relevant areas while skipping unrelated segments, maintaining measurement precision for critical areas while improving overall productivity.
3Loss of information
If the system reads all replacement clusters to rebuild TDFL, then completeness of defect information is ensured, but time consumption increases
Solution Approach 1:
The patent applies partial action by scanning only replacement clusters that are indicated as potentially problematic through inconsistency flags, rather than reading all replacement clusters on the disc. This selective approach ensures that critical defect list information is recovered while avoiding the excessive time cost of comprehensive scanning of all replacement clusters.
Data Source
AI summary
A controller for recovering disc management information is provided. The controller controls a pickup head unit to search the TDMAs for readable disc management information which is included in an in-use TDMA of the TDMAs; then determines whether a piece of information associated with an inconsistency flag of the readable disc management information is reliable. When the controller detects that the piece of information is unreliable, the controller determines at least a detection condition according to the information which is included in the readable disc management information and the in-use TDMA, and controls the pickup head unit to detect the recording medium to determine an update on the piece of information associated with the inconsistency flag under at least a detection condition. The controller generates update disc management information according to the readable disc management information and the update on the piece of information associated with the inconsistency flag.