Multilayer Optical Disc Sparing Destination Selection
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Solution Overview
Problem
Multilayer optical discs face challenges in managing tracks for user data and management information, leading to deteriorated reliability and operation efficiency due to interference between layers and inefficient sparing processing, where recording often occurs at positions different from specified requests.
Innovation Solution
A recording apparatus and method that employs a control unit to determine a sparing destination through prioritized processing, selecting the next recording address of a track being recorded as the first priority and an overlapping track in the layering direction as the second priority, ensuring concentrated and distributed information recording to maintain reliability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multilayer optical discs are used to increase recording capacity, then recording capacity is improved, but interference between layers occurs causing deteriorated reliability and operation efficiency
Solution Approach 1:
The patent segments the recording medium into multiple independent layers, each capable of separate recording and reproduction operations. The optical pickup can selectively focus on specific layers, preventing interference between layers while maintaining high recording capacity. Each layer operates independently with its own track management system.
Solution Approach 2:
The patent utilizes the depth dimension by stacking multiple recording layers at different focal depths within the optical disc. This three-dimensional arrangement increases recording capacity without causing lateral interference, as the laser can precisely focus on the desired layer by adjusting the objective lens position.
2Reliability
If conventional sparing processing is performed on multilayer discs, then defect coverage is achieved, but operation efficiency deteriorates due to position reassignment
Solution Approach 1:
The patent implements a self-service sparing mechanism where the system automatically detects defects and performs sparing processing without requiring host system intervention. The drive controller manages defect registration, sparing destination selection, and data redistribution transparently, maintaining high operation efficiency while ensuring reliable defect coverage.
3Device complexity
If tracks are managed without layer-specific organization, then simplicity is maintained, but information concentration and distribution are inefficient
Solution Approach 1:
The patent creates a universal track management system that operates consistently across all layers while adapting to layer-specific requirements. The same track management algorithms and data structures are applied uniformly to each layer, simplifying the overall system while improving information concentration and distribution efficiency through layer-aware optimization.
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 operation efficiency and reliability by ensuring suitable sparing recording, maintaining information concentration and distribution, and preventing interference between layers, thus optimizing the recording process on multilayer optical discs.
Implementation Method 1
recording of information by laser irradiation on a recording medium having a plurality of layers serving as recording layers where recording of information is performed by laser irradiation
Data Source
AI summary
A recording apparatus includes: a recording unit to record information by laser irradiation on a recording medium having multiple recording layers where information is recorded, with a track formed in the layers as a continuous recording area and data recorded within a track, and also multiple tracks set to one layer according to recording purpose; and a control unit to determine a sparing destination where information is recorded on a recording position specified according to a recording request, and if sparing processing occurs, as a first priority the next recording address of a track being recorded is selected as a sparing destination, and as a second priority the next recording address of a track overlapped with a track where recording is performed according to the recording request in a layering direction of the layers is selected as a sparing destination, and to cause the recording unit to execute sparing recording.