Optical Disc Drive RAID Data Reproduction Method
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Solution Overview
Problem
When user data is recorded on multiple optical discs using RAID technology, issues arise if the number of optical discs exceeds the number of optical disc drives, preventing simultaneous data reading and reproduction, especially when data is recorded on both sides of the discs or when the reading device can only access one side.
Innovation Solution
An optical disc reading method that loads a subset of optical discs as a first group, reads and stores data from this group, and then reproduces the user data using the remaining discs, employing a controller to manage data distribution and error correction across multiple optical disc drives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If user data is recorded on multiple optical discs using RAID technology, then data reliability and redundancy are improved, but the system becomes unable to reproduce data when the number of optical disc drives is less than the number of optical discs
Solution Approach 1:
The patent divides the plurality of optical discs into two groups: a first group that is loaded and read in the optical disc drive, and a second group that remains outside the drive. This segmentation allows the system to work around the limitation of having fewer drives than discs by processing discs in manageable groups while maintaining RAID functionality.
Solution Approach 2:
The patent performs preliminary reading and storage of data from the first group of optical discs into a storage unit before attempting to reproduce the complete user data. This preliminary action enables the system to have part of the required data available while the remaining discs are still outside the drive, facilitating data reproduction despite the drive count limitation.
2Productivity
If all optical discs are loaded simultaneously into optical disc drives, then data reading speed is improved, but the system requires more optical disc drives than are typically available
Solution Approach 1:
The patent applies partial action by loading only a subset (first group) of the optical discs into the drive at any given time, rather than requiring all discs to be loaded simultaneously. This approach achieves sufficient data reading progress without requiring an excessive number of drives, making the system practical for typical hardware configurations.
3Reliability
If optical discs are used as removable storage media with RAID technology, then data redundancy is achieved, but data cannot be reproduced in different environments from those used for recording
Solution Approach 1:
The patent creates a universal data reproduction method that works across different environments by separating the data reading process from the recording environment specifics. The controller manages the group-based loading and reading process in a way that is independent of the original recording setup, allowing data to be reproduced in different hardware configurations while maintaining redundancy benefits.
Data Source
AI summary
An optical disc device includes: an optical disc drive that reads data from a plurality of optical discs in which user data is recorded while distributed in the plurality of optical discs; a memory unit in which data read from an optical disc of a first group that is a part of the plurality of optical discs is recorded through the optical disc drive; and a controller that reproduces the user data from data of a remaining optical disc except for the first group, the data of the remaining optical disc being read through the optical disc drive, and the data recorded in the memory unit.