Dual-Layer Optical Disc Recording with Compatibility Areas
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Solution Overview
Problem
Current information recording technologies face challenges in efficiently utilizing the recording capacity of dual-layer optical discs, particularly in ensuring compatibility with read-only devices and maintaining data integrity, as they require additional recording processes that reduce available space for user data.
Innovation Solution
An information recording apparatus and method that includes a recording device for dual-layer optical discs, with a first controlling device for alternating data recording between layers and a forming device to create compatibility areas, allowing for efficient data distribution and compatibility with read-only devices without reducing recording capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional recording processes are performed to ensure compatibility with read-only devices, then compatibility is improved, but recording capacity is reduced
Solution Approach 1:
The optical disc is divided into multiple recording layers (L0 and L1), allowing data to be distributed across layers. Compatibility areas are formed in specific layers rather than requiring additional recording in all layers, thus maintaining compatibility while preserving recording capacity.
Solution Approach 2:
The patent transitions from single-layer recording to multi-layer recording, adding a vertical dimension to data storage. This allows compatibility information to be stored in one layer while user data is stored in other layers, resolving the conflict between compatibility requirements and recording capacity.
2Adaptability or versatility
If layer jump recording is performed to maintain compatibility, then compatibility is improved, but data recording efficiency is reduced
Solution Approach 1:
Compatibility areas are formed in advance in specific layers before user data recording. This preliminary action ensures that read-only devices can access compatibility information without requiring subsequent layer jumps during normal data operations, thereby improving recording efficiency.
Solution Approach 2:
The compatibility assurance function is extracted and placed in dedicated compatibility areas within specific layers, separate from the main user data areas. This separation allows the recording process to proceed efficiently in user data areas without frequent layer jumps, while still ensuring compatibility through the extracted compatibility structures.
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
The solution enables effective use of recording capacity on dual-layer optical discs by alternating data recording between layers and forming compatibility areas, ensuring compatibility with read-only devices without reducing the space available for user data, thus optimizing data storage efficiency.
Implementation Method 1
an information recording apparatus, such as a DVD recorder, focuses a laser beam for recording on a recording layer located on the front side (i.e. on the closer side to an optical pickup) viewed from the irradiation side of the laser beam (referred to as a 'L0 layer' as occasion demands in the application), to thereby record data into the L0 layer in a heat change recording method (in other words, an irreversible recording method)
Data Source
AI summary
An information recording apparatus (200) is provided with: a recording device (353) for recording data onto an information recording medium (100) being provided with a first recording layer (L0) and a second recording layer (L1); a first controlling device (354) for controlling the recording device to record the data into each of the first recording layer and the second recording layer; a forming device (354) for forming a compatibility area (106, 109, 116, 119) for realizing reproduction compatibility of the information recording medium on an information recording apparatus, following the data recorded in each of the first recording layer and the second recording layer; and a second controlling device (354) for controlling the recording device to record the data into the formed compatibility area if the data is recorded after the compatibility area is formed.