Optical Disc Block Padding for Selective Error Correction
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Solution Overview
Problem
Existing data recording and reproducing methods face challenges in accurately identifying valid and invalid data within recording unit blocks, leading to inefficient error correction and increased error rates during data addition or update operations on information storage media.
Innovation Solution
The method involves writing recording unit blocks with partially padded invalid data and using padding information to confirm the presence of invalid data, allowing for error correction and data updating or addition without relying on successful error correction of the entire block, and generating replacement blocks as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If error correction is performed on the entire error correction block including padded meaningless data, then error correction of meaningful data is possible, but error correction of the entire block becomes impossible and the operation must be retried or reported as error
Solution Approach 1:
The error correction block is segmented into meaningful data portions and padded meaningless data portions. The system identifies and processes only the meaningful data segments for error correction, rather than attempting to correct the entire block including padding. This segmentation allows successful error correction without requiring retries.
Solution Approach 2:
Padding information acts as an intermediary that marks the boundary between meaningful data and padded meaningless data. This intermediary enables the disc drive to distinguish valid data from invalid padding, allowing selective error correction processing and avoiding unnecessary retry operations.
2Measurement precision
If the disc drive attempts error correction on blocks with padded meaningless data, then thorough error checking is performed, but unnecessary retrial processes increase and error rates rise
Solution Approach 1:
Padding information is prepared and recorded in advance alongside the meaningful data. This preliminary action marks the data structure before the error correction process begins, enabling the disc drive to quickly identify meaningful data boundaries without requiring retry attempts or extensive error detection procedures.
3Ease of manufacture
If meaningless values are added to fill the error correction block, then the block structure is completed, but the disc drive cannot identify which part is meaningful data and which is padded data
Solution Approach 1:
Padding information serves as a distinctive marker that differentiates meaningful data from padded meaningless data. Similar to using color coding to distinguish different types of data, the padding information provides a clear identifier that enables the disc drive to easily detect and separate valid data portions from invalid padding portions.
Data Source
AI summary
A recording and/or reproducing method, a recording and/or reproducing apparatus, and a computer readable recording medium storing a program for performing the method. A recording unit block in which invalid data is partially padded is written on an information storage medium along with padding information indicating that the invalid data is included in the recording unit block. The padding information is useful in determining whether the recording unit block includes the padding data. Accordingly, unnecessary retrial processes of a drive system are reduced such that the performance of the drive system is improved and error correction capability is enhanced.