Optical Disk Land-Groove Track Interference Reduction
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Solution Overview
Problem
Current land-and-groove recording technologies on optical disks face inefficiencies due to wasted data recording area and instability in data reading, particularly when increasing track recording density, as they require separate areas for data and address information.
Innovation Solution
The optical disk alternately arranges land tracks and groove tracks in a radial direction, allowing for the recording of bit patterns on both by forming marks and spaces, with each track containing run-in and data regions, and using different run-in patterns for adjacent record blocks to improve data stability and recording linear density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If land-and-groove recording technology is used to increase track recording density, then recording linear density is improved, but data reading stability deteriorates due to interference between adjacent tracks
Solution Approach 1:
The patent applies different run-in patterns specifically to adjacent record blocks on land tracks and groove tracks. This local differentiation reduces interference between adjacent tracks while maintaining high recording linear density, thereby improving data reading stability without sacrificing recording capacity
2Quantity of substance
If separate areas are provided for data and address information in land-and-groove recording, then data recording capacity is improved, but data recording area is wasted
Solution Approach 1:
The patent merges the address information storage with the data recording area by recording address information in the run-in region of record blocks. This eliminates the need for separate address areas while maintaining full data recording capacity, thereby eliminating wasted recording area
Data Source
AI summary
There are provided an optical disk and an optical disk recording method which are capable of stable data reading in a case where a recording linear density is increased. According to an optical disk of the present disclosure, a run-in pattern recorded in a groove track and a run-in pattern recorded in a land track are made different patterns so that no great change is caused in the amplitude of an acquired signal due to interference between adjacent recording patterns, and thus, data may be stably read.