Optical Disc Data Recording Error Prevention via Adjacent Land State Matching
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Solution Overview
Problem
The land and groove recording scheme on optical discs often results in data recording errors due to minute differences in reflected light from lands on both sides of a groove, leading to inaccurate tracking and recording errors when data is recorded on both lands and grooves.
Innovation Solution
An information processing device with a data processing unit that detects or matches the data recording states of grooves or lands on both sides adjacent to a data recording target, performing processes such as dummy data recording or skipping to ensure accurate data recording by maintaining consistent data recording states on both sides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If land and groove recording scheme is applied to increase data recording capacity, then data recording density is improved, but recording accuracy deteriorates due to minute differences in reflected light from lands on both sides of a groove
Solution Approach 1:
The patent applies preliminary action by recording dummy data on lands adjacent to the target groove before performing the actual data recording on the groove. This preliminary recording ensures that the lands on both sides of the groove have the same recording state, which equalizes the reflected light and enables accurate tracking during the subsequent data recording process on the groove.
2Quantity of substance
If data recording is performed on both lands and grooves to double data capacity, then storage density is improved, but tracking accuracy deteriorates due to inconsistent reflected light from adjacent lands
Solution Approach 1:
Before recording data on a groove, the system performs preliminary recording of dummy data on the lands adjacent to the groove. This ensures that both adjacent lands are in the same recording state (either both recorded or both unrecorded), which creates consistent reflected light conditions and enables accurate tracking during groove data recording.
Solution Approach 2:
The system uses feedback from the recording state detection to determine whether dummy data recording is needed. By detecting the current recording states of adjacent lands and comparing them, the system decides whether to perform preliminary dummy recording to equalize the reflected light conditions, thereby maintaining tracking accuracy while enabling high-density storage.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively prevents recording errors by ensuring consistent data recording states on both lands and grooves, allowing for reliable data recording on optical discs.
Implementation Method 1
One cause for such recording errors is considered to be that a minute difference occurs in reflected light from lands on both sides of a groove of a data recording region and tracking is not accurately performed.
Data Source
AI summary
A configuration for preventing a recording error when a data recording process is performed on both lands and grooves of an optical disc is realized. An information processing device includes a data processing unit configured to control a data recording process on both lands and grooves of an optical disc. The data processing unit performs a process of detecting or matching positions at which data recording states of grooves or lands on both sides adjacent to a data recording target land or groove match when data are recorded on the lands or the grooves. The data processing unit performs, for example, a dummy data recording process or a skipping process as the process of matching the data recording states of the grooves or the lands on both sides adjacent to the data recording target land or groove.