Selective Subsegment Rewriting for High-Density Optical Recording
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Solution Overview
Problem
Existing high-density optical recording systems face inefficiencies in data throughput and storage space due to the need to re-record entire blocks or codewords when errors are detected, especially for larger block sizes, which degrades data throughput and requires excessive space.
Innovation Solution
A rewrite system that selectively records and verifies only meaningful subsegments of data blocks with errors, using the same error correction methodology as the original data, allowing for uninterrupted 'streamer mode' operation and minimizing storage needs by rewriting only erroneous subsegments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If entire data blocks are re-recorded when errors are detected, then data integrity is improved, but data throughput deteriorates and storage space is wasted
Solution Approach 1:
The patent segments data blocks into smaller sub-segments and selectively re-records only the erroneous sub-segments rather than entire data blocks. This segmentation allows the system to maintain data integrity by correcting only the necessary portions, thereby preserving throughput by avoiding redundant re-recording of error-free data.
Solution Approach 2:
The patent extracts and identifies only the specific erroneous sub-segments from data blocks during verification, separating them from the correct data. This extraction enables the system to re-record minimal data (only the erroneous portions) while maintaining overall data integrity and maximizing throughput by leaving correct data untouched.
2Quantity of substance
If larger block sizes are used to increase storage capacity, then storage efficiency is improved, but the complexity of error verification and rewrite operations increases
Solution Approach 1:
The patent divides large data blocks into smaller manageable sub-segments for verification and error identification. This segmentation reduces the complexity of error verification operations by allowing the system to process and analyze smaller units independently, while still maintaining the benefit of using large block sizes for storage efficiency.
Solution Approach 2:
The patent applies different verification and processing approaches to different sub-segments based on their error status. Correct sub-segments are quickly validated and left untouched, while erroneous sub-segments receive detailed analysis and re-recording. This local quality approach optimizes the verification process for large blocks by focusing computational resources only where needed.
3Measurement precision
If frequent start and stop actions are performed at each data block boundary, then error verification accuracy is improved, but tape wear increases and throughput decreases
Solution Approach 1:
The patent enables continuous tape movement and uninterrupted recording by verifying and correcting errors without stopping the tape transport. The system performs error verification and selective re-recording during continuous operation, eliminating the wear and throughput loss associated with frequent start-stop actions while maintaining verification accuracy through persistent error tracking and correction.
Solution Approach 2:
The patent performs preliminary error verification on data blocks during the initial recording pass, identifying erroneous sub-segments before they cause problems. This preliminary action allows the system to plan and execute selective re-recording of only necessary portions without interrupting tape movement, thereby reducing wear while maintaining verification accuracy.
Data Source
AI summary
Strategy and methodology by which the various error sources are taken into account and methods applied to compensate substantially entirely for such errors and/or diminish the effect of such errors.