Optical Disc Address Format for Capacity Expansion
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Solution Overview
Problem
Conventional optical discs have limited recording capacity due to their 18-bit block address format, which restricts the expandability beyond 16.7 GB, and changing to a higher address format requires new hardware, increasing costs and compatibility issues.
Innovation Solution
An optical disc format that uses M-bit first digital information and N-bit second digital information to represent block addresses, where the value of the block address determines how the second digital information is interpreted, allowing for values up to 19 bits without changing the total number of bits recorded, ensuring compatibility with existing systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the block address format is expanded from 18 bits to 19 bits or more, then the recording capacity can exceed 16.7 GB, but new hardware must be developed increasing costs and reducing compatibility with existing systems
Solution Approach 1:
The address information is segmented into two parts: the original 18-bit block address and a new 1-bit flag. This segmentation allows the system to maintain compatibility with existing 18-bit address structures while adding a single bit to indicate extended capacity modes, enabling recording beyond 16.7 GB without requiring complete hardware redesign
Solution Approach 2:
Instead of simply expanding the address space horizontally (more bits), the invention adds a vertical dimension by introducing a flag bit that indicates whether the address should be interpreted in the traditional 18-bit mode or an extended mode. This dimensional approach allows the same physical medium to support both legacy and expanded capacity formats
2Adaptability or versatility
If a new address format is implemented to increase recording capacity, then storage expandability improves, but hardware changes are required increasing device complexity and cost
Solution Approach 1:
The address interpretation is made dynamic through the flag bit. The system can adaptively switch between 18-bit and extended address modes based on the flag value, allowing the same hardware to handle both conventional and expanded capacity discs without requiring multiple dedicated hardware configurations
Solution Approach 2:
The flag bit serves multiple functions: it indicates extended capacity mode, triggers appropriate address interpretation, and enables the system to handle both legacy and new format discs with a single hardware configuration, reducing the need for specialized hardware for different capacity types
Data Source
AI summary
An address format for appropriately controlling the recording linear density and the number of information recording layers is provided in order to increase the recording capacity of an information recording medium such as an optical disc or the like in a range in which a necessary S/N ratio can be guaranteed. An optical disc includes an information recording layer having a concentric or spiral track, and has a format for describing a track address, which is pre-recorded on the track or is to be added to data that is to be recorded on the information recording layer. The format includes layer information regarding the information recording layer and address information regarding the track address.