Optical Disk Drive Power Calibration Area Erasing Method
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Solution Overview
Problem
Rewritable optical disks experience high data reading failure frequencies due to suboptimal power calibration procedures, leading to potential data loss during initial writing attempts.
Innovation Solution
An optical disk drive with a determining, erasing, and executing module is implemented to assess and erase the power calibration area if unrecorded, followed by an optimum power calibration procedure to determine the correct writing power for the optical pick-up head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power calibration area is not erased before OPC procedure, then the OPC procedure can be executed quickly, but the reading failure frequency increases due to residual data interference
Solution Approach 1:
The patent applies preliminary action by checking the recording status of the power calibration area before executing the OPC procedure and erasing it in advance if necessary. This preliminary erasing action removes residual data that would interfere with the calibration process, ensuring reliable calibration results while avoiding the time waste of erasing after the fact. The determination step identifies whether erasing is needed before the OPC procedure begins.
2Reliability
If the power calibration area is erased every time before OPC, then reading failure frequency is reduced, but the device complexity and operation steps increase
Solution Approach 1:
The patent applies local quality by treating the power calibration area differently from other areas on the disc. Instead of applying a universal erasing operation to the entire disc or always erasing the calibration area, the system specifically targets only the power calibration area and only when necessary (when residual data is detected). This localized approach reduces unnecessary operations while ensuring calibration reliability.
Solution Approach 2:
The system performs self-service by automatically determining whether the power calibration area contains residual data and deciding whether erasing is necessary. The determination module autonomously assesses the recording status and controls the erasing operation accordingly, eliminating the need for manual intervention or complex external control systems.
3Quantity of substance
If residual data remains in the power calibration area, then storage capacity is maximized, but the OPC procedure produces inaccurate results leading to data writing failures
Solution Approach 1:
The patent applies the taking out principle by extracting and isolating the power calibration area from the rest of the storage medium. The system specifically identifies and processes only this critical area, separating it from the general storage operations. By extracting the calibration area for special handling (checking and conditional erasing), the system ensures calibration accuracy without unnecessarily affecting overall storage capacity utilization.
Data Source
AI summary
An optimum power calibration method is provided and is implemented for writing a rewritable optical storage medium including a power calibration area. The method includes the steps of determining whether the power calibration area is recorded with data, erasing the entire power calibration area when the power calibration area is not recorded, and executing an optimum power calibration procedure. In addition, the optimum power calibration method is applied to a rewritable optical disk drive.