Optical Disc Virtual Address Space for High-Defect Recording
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Solution Overview
Problem
The existing replacement methods for optical disc recording media, such as using a spare area, can lead to decreased recording and reproducing rates due to frequent seeking, and combining slipping replacement with spare area replacement faces challenges in managing data when the defect rate is high, particularly in inferior products, resulting in incomplete data recording.
Innovation Solution
A recording and reproducing apparatus that defines a virtual address space by adding a spare area to the logical address space and a buffer area to the physical address space, allowing for efficient replacement of recording areas using virtual addresses, thereby preventing situations where data lacks a physical address during slipping replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If replacement of recording area with spare area is executed for each defect occurrence, then data integrity is maintained, but recording rate and reproducing rate decrease due to frequent seeking
Solution Approach 1:
The patent segments the replacement process into two distinct methods: slipping replacement for initial defect handling and spare area replacement for subsequent defects. This segmentation allows the system to optimize for speed initially (using slipping replacement that maintains continuous recording) while preserving data integrity capabilities (using spare area replacement when needed), thereby resolving the contradiction between maintaining data integrity and preserving recording rate.
2Productivity
If slipping replacement is used to maintain recording rate, then seek distance is reduced, but data may lack physical address when defect rate is high
Solution Approach 1:
The patent implements a dynamic switching mechanism that adapts the replacement method based on real-time defect conditions. When defect rate is low, slipping replacement is used to maintain high recording rate. When defect rate exceeds a threshold or cumulative defect length exceeds buffer capacity, the system dynamically switches to spare area replacement. This dynamic adaptation resolves the contradiction by allowing the system to optimize for recording rate under normal conditions while ensuring data addressability when defect rates become problematic.
3Productivity
If buffer area is added to physical address space for slipping replacement, then seek operations are reduced, but address management complexity increases
Solution Approach 1:
The patent introduces a buffer area as an intermediary zone between the logical address space and the spare area. This buffer serves as a temporary storage that absorbs the complexity of address management during slipping replacement operations. The buffer acts as a mediator that allows continuous recording to proceed without immediate seek operations, while the complex address management is confined to the buffer-spare area transition rather than affecting the entire address space. This intermediary structure resolves the contradiction by localizing complexity management.
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
This approach enhances recording and reproducing rates by reducing seek distance and ensuring complete data recording even in high-defect scenarios by effectively managing virtual addresses for data replacement.
Implementation Method 1
a light radiating unit for radiating light to the optical recording medium
Data Source
AI summary
There is provided a recording apparatus including a light radiating unit that radiates light to an optical recording medium, a recording unit that performs light emission control of the light radiating unit, and performs recording on the optical recording medium, and a control unit that performs control in a manner that, in a state in which a logical address space, a virtual address space obtained by adding at least a spare area to the logical address space, and a physical address space obtained by adding a buffer area to the virtual address space are defined, a process for replacing a recording area of the optical recording medium with the spare area is executed using a virtual address.