Optical Disc Device Memory Management for Initialization Time
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Solution Overview
Problem
Existing optical disc management systems require frequent loading and accessing of management information, leading to increased time consumption and complex control over multiple optical-disc drive devices, which complicates the management of plural optical discs.
Innovation Solution
Storing management information about plural optical discs in a memory, such as flash memory or SSD, allows for efficient management by reducing the need to write this information onto each optical disc every time a defect occurs, and utilizing unique identification information for authentication and data protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If management information is stored on optical discs and accessed frequently, then data availability is improved, but time consumption increases and device complexity increases
Solution Approach 1:
The patent creates a copy of the management information storage function by introducing a memory device. Instead of storing all management information on optical discs and reading it frequently (which causes time loss), the system copies essential management information to a memory device that can be accessed much faster, thereby reducing initialization time while maintaining data availability.
Solution Approach 2:
The memory device acts as an intermediary between the optical discs and the control unit. It stores management information that needs frequent access, serving as a bridge that reduces the need to repeatedly access the optical discs, thus solving the time consumption problem while maintaining reliable data access.
2Adaptability or versatility
If multiple optical-disc drive devices are added to manage plural optical discs, then management capability is improved, but control complexity increases
Solution Approach 1:
The patent makes the single memory device universal by having it store management information for multiple optical discs. Instead of needing separate drive devices for each disc, the memory device serves all discs by storing their management information, thereby improving management capability while reducing control complexity.
Solution Approach 2:
The patent merges the management information storage function from multiple optical discs into a single memory device. By combining the management information of all discs in one centralized memory location, the system achieves better management capability without requiring multiple separate drive devices, thus reducing control complexity.
3Reliability
If management information is written onto optical discs every time a defect occurs, then data accuracy is improved, but time consumption increases
Solution Approach 1:
The patent applies preliminary action by storing management information in the memory device before defects occur. The system proactively maintains accurate management information in the fast-access memory, so when defects occur, the information is already available for quick updates without requiring time-consuming writing operations to optical discs.
Solution Approach 2:
The patent uses a copy of the management information storage function by implementing a memory device that mirrors the optical disc storage. This copy allows for rapid updates and reads without the mechanical constraints of optical discs, maintaining data accuracy while significantly reducing the time required for writing and reading operations.
Data Source
AI summary
There are provided an optical disc device and its recording/reproducing method for managing the management information about plural optical discs efficiently. In the present invention, the management information about the plural optical discs is stored in a memory. Moreover, the management information about part or all of the optical discs stored in the memory is recorded in the optical disc.