Defect List Management for Rapid Re-initialization of Rewritable Media
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Solution Overview
Problem
The process of re-initializing a re-writable information storage medium is time-consuming due to the need to verify and manage defect blocks caused by scratches, fingerprints, or dust, which increases the number of defect blocks over time.
Innovation Solution
An information recording medium with a data area that includes a user data area and a spare area for replacement blocks, where defect list entries track the status of defect blocks and replacement blocks, allowing for quick re-initialization by changing status information to indicate defect blocks as re-initialized and usable or unusable, thereby reducing the need for extensive verification processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If defect blocks are verified through recording and disc verification during re-initialization, then reliability of defect management is improved, but re-initialization time increases significantly
Solution Approach 1:
The patent applies preliminary action by pre-managing defect blocks through a defect list that tracks the status of all blocks before re-initialization. The system identifies and records defect blocks in advance, maintaining their status information in a defect list structure that includes block addresses and status flags. This preliminary defect management allows the re-initialization process to simply update status information rather than perform extensive verification, thereby reducing re-initialization time while maintaining reliability through the structured defect tracking system.
2Measurement precision
If extensive verification processes are performed to determine defect block status, then measurement precision of defect detection is improved, but re-initialization speed decreases
Solution Approach 1:
The patent applies the copying principle by creating a defect list that contains copied status information about defect blocks. Instead of performing new verification processes during re-initialization, the system copies and updates status information from the existing defect list. The defect list entries include block addresses and status flags that are updated during re-initialization, allowing the system to determine defect block status by referencing this pre-created information structure rather than performing extensive new verification, thus maintaining precision while improving speed.
3Reliability
If defect blocks are tracked with detailed status information, then reliability of block management is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the defect management system into distinct components: a defect list data structure with separate entries for each block, status information fields for tracking block states, and a replacement block management system. Each defect block is represented as a separate entry in the defect list with its own status information. This segmented structure allows the system to maintain detailed tracking of multiple defect blocks independently, improving block management reliability while keeping the complexity organized and manageable through modular data structures.
Data Source
AI summary
An information recording medium, a method of recording and/or reproducing data to/from the medium, and a recording/reproducing apparatus using the medium, the medium having a data area including a user data area to record user data, and a spare area to record replacement blocks that replace defect blocks occurring in the user data area, wherein defect list entries include status information of the defect blocks and the replacement blocks, and the status information of the defect blocks in the user data area is changed, and the status information of the replacement blocks in the spare area is changed, in response to the spare area being newly allocated to re-initialize the medium.