Write-Once Disc Hierarchical Access Information Areas
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Solution Overview
Problem
On a write-once disc, accessing updated information is time-consuming due to the need for a large update area and the lack of efficient location tracking, especially when update areas are allocated within data areas, leading to prolonged search times for the final update location.
Innovation Solution
Implementing a write-once disc with multiple update areas and dedicated access information areas, including main and sub access information areas, to quickly identify the location of updated information by recording location information and flags, reducing the time required to access the final update area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a large update area is allocated to the data area to accommodate multiple updates, then the capacity for update operations is improved, but the time to detect and access the final update location increases significantly
Solution Approach 1:
The patent creates access information areas (main and sub) in advance before updates occur, establishing a hierarchical indexing structure that will guide future access operations. This preliminary organization of access paths allows the system to quickly locate final update locations without searching through the entire large update area, thus resolving the contradiction between maintaining large update capacity and reducing access time.
Solution Approach 2:
The patent introduces access information areas as intermediary structures between the data area and the final update locations. These access areas contain main access information and sub access information that act as mediators, guiding the search process through hierarchical levels rather than requiring direct traversal of the entire update area, thereby significantly reducing access time while preserving update capacity.
2Quantity of substance
If the update area is allocated within the data area to increase available space, then the storage capacity is improved, but the ability to quickly detect the final update location deteriorates
Solution Approach 1:
The patent segments the detection process into multiple hierarchical levels by creating main access information areas and sub access information areas. This segmentation divides the large update area into manageable sections with their own access indices, making it easier to detect and locate final update locations without having to search the entire data area, thus resolving the contradiction between storage capacity and detection difficulty.
Solution Approach 2:
The patent adds a new dimensional layer to the data structure by introducing access information areas that exist separately from the data area itself. This creates a two-dimensional access structure where the first dimension is the access information hierarchy and the second dimension is the physical data location, enabling efficient detection of final update locations even when update areas are dispersed throughout the data area.
3Adaptability or versatility
If multiple update areas are used to record updated information, then the flexibility and update management are improved, but the complexity of tracking the final update location increases
Solution Approach 1:
The patent establishes access information areas in advance that will track multiple update areas, creating a predefined hierarchical tracking structure. This preliminary setup includes main access information for overall update area identification and sub access information for specific location tracking, which simplifies the complexity of managing multiple update areas by providing a structured tracking framework before updates occur.
Solution Approach 2:
The patent implements a feedback mechanism where access information areas continuously record and update the locations of final updates across multiple update areas. The main access information and sub access information work together to provide feedback about the current state of updates, allowing the system to track final update locations efficiently without increasing complexity, as the tracking information is automatically maintained and updated.
Data Source
AI summary
A write-once disc includes: a plurality of update areas in which a predetermined kind of updated information is recorded; at least one main access information area in which main access information is recorded, the main access information indicating a final update area in which finally updated information is recorded among the plurality of update areas; and at least one sub access information area in which sub access information is recorded, the sub access information indicating a location of the finally updated information recorded in the final update area. Accordingly, an access time for reading a predetermined kind of information required to use the write-once disc can be reduced.