Optical Disc Data Writing Outer Edge Inversion
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Solution Overview
Problem
Optical disc drives operating in modes other than constant linear velocity (CLV) face performance bottlenecks due to slow writing speeds, especially when the data size is less than the disc's capacity, leading to suboptimal performance in data transfer rates and writing speed.
Innovation Solution
A method and system that involve determining the data size and storage capacity of an optical disc, generating a file system image, and writing data starting from a location near the outer region of the disc, rather than adjacent to the inner edge, to optimize data transfer rates and writing performance, particularly when used with optical disc drives operating in constant angular velocity (CAV) mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data is written starting from the inner edge of the optical disc, then the writing process follows the conventional spiral track direction, but the data transfer rate and writing speed are reduced, especially for optical disc drives operating in CAV mode
Solution Approach 1:
The patent inverts the conventional writing direction by starting data writing from the outer edge of the optical disc and moving inward, rather than the traditional inner-edge-to-outer-edge spiral direction. This inversion allows the data to be positioned in the region where the optical head achieves highest linear velocity during reading, thereby improving data transfer rate and writing speed for CAV mode drives.
Solution Approach 2:
The patent changes the spatial parameter of data placement on the disc by calculating and positioning the data start location based on the disc's total capacity and the data size, rather than always starting from the inner edge. This parameter change optimizes the data location to maximize transfer performance for CAV mode operation.
2Speed
If optical disc drive operates in CAV mode, then data tracks at outer regions have higher linear velocity and data transfer rates increase, but writing speed remains slow when data size is less than disc capacity
Solution Approach 1:
The system performs preliminary calculation of the optimal data start location on the disc before writing begins. By pre-determining the starting position based on disc capacity and data size, the system ensures that data is written to begin at the optimal location that maximizes transfer rate during the writing operation, rather than using a fixed conventional starting point.
3Ease of operation
If data is written at the beginning of the disc (inner edge), then the writing process is simple and follows standard conventions, but the data is positioned in a region with lower linear velocity resulting in slower transfer rates
Solution Approach 1:
The patent changes the spatial parameter of data placement by calculating the optimal start location based on disc capacity and data size, rather than using a fixed conventional starting position. This parameter change optimizes the data location to maximize transfer performance for CAV mode operation while maintaining the simplicity of the writing process through automated location calculation.
Data Source
AI summary
Systems and methods are disclosed for writing data to an optical disc. In one example, a method includes the steps of receiving data to be written to an optical disc, determining the size of the data to be written to the optical disc, generating a file system image for the optical disc, writing the file system image to the optical disc and writing the data to the optical disc at a space beginning at a LBA located at a distance equal to about the size of the data from the last available LBA and terminating at about the last available LBA of the optical disc.