Disc Padding Information for Reliable Error Correction Blocks
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Solution Overview
Problem
Current data recording and reproduction methods on information storage media, such as HD-DVDs and DVDs, face challenges in distinguishing between valid and invalid data within error correction blocks, leading to unreliable error correction and reproduction due to the inability to differentiate between meaningful and meaningless data within these blocks.
Innovation Solution
The method involves recording padding information indicating the presence, location, or value of invalid data within recording or reproducing unit blocks, allowing the system to extract and correct only the valid data, thereby improving data reproduction reliability and system stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If data is recorded in fixed-size error correction blocks with padding for incomplete blocks, then the recording structure is simplified and error correction can be performed uniformly, but the system cannot distinguish between valid data and padded invalid data, causing error correction to fail for the entire block
Solution Approach 1:
The patent introduces padding information as an intermediary element that mediates between the valid data and the error correction mechanism. This padding information explicitly marks which portions of the error correction block contain valid data versus padded invalid data, allowing the error correction system to selectively process only the valid portions without being misled by the padded data.
Solution Approach 2:
The patent segments the error correction block into distinct regions: valid data regions and padded invalid data regions. By recording padding information that identifies these segments, the system can apply error correction selectively to only the valid data portions, rather than treating the entire block uniformly.
2Ease of operation
If the disc drive attempts error correction on entire error correction blocks including padded data, then uniform error correction processing is applied, but the error correction fails because padded data contains meaningless values
Solution Approach 1:
The patent applies partial error correction action by using padding information to identify and process only the necessary valid data portions within the error correction block. Instead of applying error correction uniformly to the entire block (excessive action), the system performs error correction selectively on the valid data segments, avoiding the meaningless padded data that would cause correction failures.
3Measurement precision
If padding information is recorded to indicate invalid data locations, then valid data can be accurately extracted during reproduction, but additional recording overhead and system complexity are introduced
Solution Approach 1:
The patent performs preliminary action by recording padding information at the time of data recording, before the reproduction phase. This advance preparation allows the reproduction system to quickly identify valid data portions without requiring complex real-time analysis, thereby maintaining relatively simple system architecture while achieving high identification accuracy.
Data Source
AI summary
An apparatus and method for recording and/or reproducing data on a disc using padding information, and a corresponding information storage medium. The recording method includes recording a recording unit block in which invalid data is padded in part of the block and recording padding information indicating that the invalid data is included. According to the method, a disc drive becomes able to distinguish valid data from invalid data in an error correction block such that reliability of reproduction increases and stability of the system is improved.