Optical Head Seek Time Reduction via Local Test Data Recording
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Solution Overview
Problem
The existing methods for ensuring the reliability of record media, such as optical disks, require lengthy test processing to determine optimal access parameters, leading to increased seek times for optical heads during data recording and regeneration, especially as media density increases, causing disruptions in AV data regeneration and prolonged user data recording times.
Innovation Solution
An access unit and method that record and read test data within the user area of the record medium, allowing for the adjustment of access parameters without using the read-in or read-out areas, thereby shortening the seek time of the optical head and improving recording quality by determining suitable parameters closer to the user data location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If test processing is performed in read-in or read-out areas, then access parameter adjustment can be achieved, but seek time increases and productivity decreases
Solution Approach 1:
The patent merges the test area with the user area by allowing test data to be recorded in the user area alongside user data. This eliminates the need for separate read-in/read-out test areas, thereby reducing seek time while maintaining access parameter adjustment capability. The test data is recorded in a predetermined area within the user area, combining testing and data storage functions in one location.
Solution Approach 2:
The patent performs test data recording in advance within the user area before actual data recording operations. By preparing test patterns and adjusting access parameters preliminarily in the user area, the system avoids time-consuming seeks to separate test areas during actual data recording, thus improving productivity.
2Measurement precision
If optical head seeks to read-in or read-out area for test processing, then access parameter can be adjusted, but time loss occurs and productivity decreases
Solution Approach 1:
The patent applies local quality by performing test data recording and access parameter adjustment locally within the user area where data recording actually occurs. Instead of seeking to distant read-in or read-out areas for testing, the system conducts local testing in the same area where user data is recorded, thereby minimizing seek time while maintaining measurement precision.
3Reliability
If test processing is frequently executed for high density media, then access parameter adaptation improves, but recording time increases and productivity decreases
Solution Approach 1:
The patent performs test data recording and access parameter adjustment as preliminary actions before actual data recording. By completing the time-consuming test processing in advance within the user area, the system ensures media compatibility is optimized while minimizing the impact on actual recording time, thus improving productivity.
Data Source
AI summary
An access unit, an access method, an access program and a control unit are provided. A record medium includes a user area for recording user data which can be recorded and regenerated based on an instruction given by a user. A recording-system circuit section included in the access unit records test data based on a predetermined test condition in the user area. A regeneration-system circuit section included in the access unit reads the test data recorded in the user area by the recording-system circuit section, and a system control circuit included in the access unit refers to the test data read by the regeneration-system circuit section and adjusts an access parameter for accessing the record medium.