Optical Disk Recorder Verify Processing Time Reduction
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Solution Overview
Problem
Conventional optical disk recording/reproducing devices require significant time for verify and compare processing, which triples the time needed for write processing due to the sequential nature of these operations, leading to prolonged recording times.
Innovation Solution
Incorporating a recording quality storage part in the device, where data quality information is stored during reproduction, allowing the host controller to perform compare and verify processing by inspecting data quality intervals set in advance, thereby reducing the need for simultaneous write and verify processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If verify processing and compare processing are performed sequentially after write processing, then data recording reliability is secured, but recording time becomes three times longer than write processing time
Solution Approach 1:
The patent applies preliminary action by performing verify processing during write processing through real-time comparison of reproduced data with original data. The optical pickup reads back recorded data immediately after writing and compares it with the source data, detecting errors before the recording session completes. This eliminates the need for separate post-recording verify and compare processing, reducing total recording time to approximately the write processing time while maintaining data reliability.
2Device complexity
If the same optical pickup is used for both write processing and verify processing, then device complexity is reduced, but write processing and verify processing cannot be performed simultaneously
Solution Approach 1:
The patent implements continuity of useful action by making the optical pickup work continuously during write processing. While data is being written to the optical disk, the optical pickup simultaneously performs verify processing by reading back the recorded data and comparing it with the source data. This continuous operation eliminates idle time between write and verify operations, maximizing productivity without adding additional optical pickups or complex hardware.
Data Source
AI summary
In a recording/reproducing device for recording and reproducing an optical disk, when performing verify processing of inspecting a quality of recorded data and compare processing of inspecting whether the recorded data can be read without errors, a time is taken because the same area needs to be reproduced two times. The verify processing and the compare processing are performed at one time reproduction. To perform the verify processing and the compare processing simultaneously, a recording quality storage part is provided in the recording/reproducing device, and reproduced data is transmitted to a host controller while storing quality information at the time of reproduction by an instruction of the host controller. The host controller performs the compare processing by comparing transmitted data and data at the time of recording and inspects the recording quality by acquiring the quality information of a reproduced area from the recording/reproducing device at intervals set in advance.