Information Recording Medium Partial Area Management
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Solution Overview
Problem
Existing information recording technologies require scanning the entire recording area to update management information, which is time-consuming when management information is not updated due to power shutdown or other issues, leading to inconsistencies between management information and actual recording conditions.
Innovation Solution
Divide the recording area into multiple partial areas with separate management information and reliability information recorded for each area, allowing for targeted updates by identifying areas with low reliability, reducing the need to scan the entire area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire recording area is scanned to update management information, then the management information can be verified to be up-to-date, but the time required for updating increases significantly
Solution Approach 1:
The recording area is divided into multiple partial areas, and management information is maintained separately for each partial area. When power shutdown or errors occur, only the affected partial area needs to be reverified rather than scanning the entire recording area, thus reducing update time while maintaining reliability.
Solution Approach 2:
Different reliability states are assigned to different partial areas based on their individual update status. The system tracks which specific partial areas have outdated management information and focuses verification efforts only on those areas, rather than uniformly verifying the entire recording area.
2Quantity of substance
If management information is not recorded onto the information recording medium, then storage space is conserved, but inconsistency between management information and actual recording condition occurs
Solution Approach 1:
The management information is extracted from the main data storage area and maintained in a separate information area. This separation allows the management information to be updated and verified independently without affecting the main data storage capacity, while ensuring consistency through targeted updates of only the necessary partial areas.
3Loss of time
If the recording area is divided into multiple partial areas with separate management information, then update time is reduced, but device complexity increases
Solution Approach 1:
The recording area is divided into multiple partial areas, and management information is maintained separately for each partial area. When power shutdown or errors occur, only the affected partial area needs to be reverified rather than scanning the entire recording area, thus reducing update time while maintaining reliability.
Data Source
AI summary
An information recording medium is provided with: a recording area divided into a plurality of partial areas; and an information area for recording therein (i) management information for managing recording conditions of the plurality of partial areas at least for each of the plurality of partial areas and (ii) reliability information for indicating reliability of the management information for each of the plurality of partial areas.