Multilayer Storage Addressing via Physical ADIP Equations
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Solution Overview
Problem
In multilayer information storage media, accurate determination of recording layer addresses during interlayer movement is challenging due to mechanical errors and medium eccentricity, leading to potential misalignment and data integrity issues.
Innovation Solution
The implementation of a physical ADIP address (PAA) system, where the address of a layer to be moved to (PAAi) and the current layer (PAAj) follow specific equations based on whether the movement is between even or odd layers, ensuring accurate address determination and correction during interlayer movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a pickup moves between recording layers during interlayer movement, then data can be accessed across multiple layers, but mechanical errors and medium eccentricity cause address determination inaccuracies
Solution Approach 1:
The patent introduces an intermediary calculation method that uses the known physical ADIP address of the current layer and a predetermined calculation formula to determine the address of the target layer, rather than directly measuring or relying solely on mechanical positioning accuracy. This intermediary mathematical relationship acts as a mediator to bridge the gap between imperfect mechanical movement and accurate address determination.
Solution Approach 2:
The patent establishes predetermined calculation formulas for address determination before interlayer movement occurs. By pre-defining the mathematical relationships between addresses of different layers, the system prepares the address calculation in advance, eliminating the need for real-time measurement during movement and reducing the impact of mechanical errors.
2Reliability
If mechanical errors and medium eccentricity are present during pickup movement, then interlayer movement becomes less reliable, but accurate address determination is still required for data integrity
Solution Approach 1:
The patent employs a feedback mechanism where the system uses the known physical ADIP address of the current layer as reference information, combines it with predetermined calculation formulas, and iteratively determines the accurate address of the target layer. This feedback approach allows the system to compensate for manufacturing precision errors by continuously referencing known accurate address information.
Solution Approach 2:
The patent changes the approach from relying on physical movement precision to using mathematical parameter calculations. By transforming the address determination problem from a physical measurement task to a mathematical calculation task using predetermined formulas, the system overcomes the limitations of manufacturing precision in mechanical components.
3Productivity
If address determination is performed during interlayer movement, then data access between layers is enabled, but misalignment and data integrity issues occur due to mechanical errors
Solution Approach 1:
The patent replaces the mechanical address determination system with a mathematical calculation system. Instead of relying on mechanical sensors or physical measurement during interlayer movement to determine addresses, the system uses predetermined calculation formulas that take the current layer's physical ADIP address as input and compute the target layer's address mathematically, thereby substituting mechanical measurement with mathematical computation.
Data Source
AI summary
An information storage medium having a plurality of recording layers is provided. The information storage medium including a physical ADIP address (PAA) which corresponds to an address recorded on the information storage medium. In the case in which an address of a layer i to which a pickup will move corresponds to PAAi, an address of a layer j in which the pickup is currently located corresponds to PAAj, and n corresponds to the number of the recording layers,the PAAi and the PAAj satisfy the equationPAAi= PAAj+(7−(i+j))*40 00 00h+00 00 01h(i+j=odd and i,j=0,1,2, . . . ,n−1)in response to the pickup moving from an even layer to an odd layer or from an odd layer to an even layer, and satisfy the equationPAAi=PAAj+(i−j)*40 00 00h(i+j=even and i,j=0,1,2, . . . ,n−1)in response to the pickup moving from an even layer to another even layer or from an odd layer to another odd layer.