Optical Disc Drive File System Conversion for TV Hosts
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Solution Overview
Problem
Audio/video (A/V) hosts, such as TV receiver sets, lack compatibility with various media types due to limited connectivity and support only FAT file systems, preventing the reproduction of data from optical discs using CDFS or UDF file systems.
Innovation Solution
An optical disc drive with an information processor and interface that converts intrinsic file systems (FAT, CDFS, or UDF) into a format compatible with A/V hosts, using a USB or wireless protocol, allowing the optical disc drive to communicate and provide physical device information, thereby enabling compatibility with hosts like PCs and TV receiver sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If A/V hosts support only FAT file system, then device complexity is reduced, but compatibility with various optical media is limited
Solution Approach 1:
The patent introduces a file system conversion mechanism that acts as an intermediary between the optical disc's intrinsic file system (CDFS/UDF) and the host's FAT file system. The conversion unit translates file system structures, allowing the host to access optical media without needing to natively support CDFS or UDF formats, thus resolving the contradiction between limited host capability and broad media compatibility
Solution Approach 2:
The invention changes the file system parameter representation by converting data structures from CDFS/UDF formats into FAT format. This involves transforming file allocation tables, directory structures, and other file system parameters into a format the host can understand, enabling compatibility without requiring the host to support multiple file system types
2Adaptability or versatility
If optical disc drive converts file systems to FAT format, then compatibility with A/V hosts is improved, but processing time increases
Solution Approach 1:
The conversion unit performs preliminary conversion of the file system structure when the optical disc is first mounted or when the host connects. By pre-converting the file system parameters and caching the converted FAT structure, the system avoids repeated conversion operations during subsequent file access, thereby reducing time loss while maintaining compatibility
Solution Approach 2:
The patent creates a virtual copy of the file system structure in FAT format within the host's address space. Instead of requiring the host to directly interpret CDFS/UDF structures, the system provides a translated copy that behaves like a standard FAT filesystem, enabling fast access without real-time conversion overhead
3Reliability
If optical disc drive uses intrinsic command set, then device functionality is preserved, but compatibility with certain hosts is reduced
Solution Approach 1:
The interface dynamically adapts its command set based on the detected host type. When a CDFS/UDF optical disc is detected, the interface converts intrinsic commands into host-specific command sets (e.g., USB mass storage commands for TV receivers). This dynamic command translation allows the same device to maintain full functionality while adapting to different host platforms
Data Source
AI summary
An optical disc drive, and a method of driving the optical disc drive are provided. Where the optical disc drive has a connectivity or a compatibility with a host that is incompatible with the optical disc drive, a file system and device information accepted by the host are provided. The host may have a compatibility with limited external medium devices and a specific command set for data exchange. The optical disc drive and the method of driving the optical disc drive may transmit compatible information to the host and select the specific command set accepted by the host, so that the optical disc drive is compatible with the host.