Optical Disc Drive Defect Management for High-Speed Reformatting

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Solution Overview

Problem

Conventional optical disc reformatting processes are inefficient, leading to prolonged data recording and reproduction times due to unnecessary substitution processing and loss of defect management information, which can result in data recording failures due to unaddressed defects.

Innovation Solution

An information recording device that maintains defect location information during physical reformatting, allowing for high-speed reformatting by avoiding unnecessary substitution processing and enabling faster data recording by assuming defects have been eliminated, thus reducing the need for extensive authentication and substitution procedures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional defect management is performed during physical reformatting, then data reliability is ensured through substitution processing, but reformatting speed decreases due to extensive authentication and substitution procedures

Engineering Contradiction:

Improvedata reliabilityVSAvoidreformatting speed

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The system performs preliminary defect management information preservation by maintaining the defect list during physical reformatting operations. Instead of erasing defect information before reformatting, the system preserves it and uses it during the reformatting process to identify and handle defective sectors, thereby avoiding the need for extensive authentication and substitution procedures while maintaining data reliability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system creates and uses a working copy of defect management information (defect list) during physical reformatting. By maintaining this copied information in memory during the reformatting process, the system can quickly identify defective sectors and perform appropriate handling without needing to re-authenticate or re-detect defects, thus improving reformatting speed while ensuring data reliability

Inventive Principle:

Principle #26Copying

2Ease of manufacture

If defect management information is erased during physical reformatting, then reformatting process is simplified, but data recording failures occur due to unaddressed defects

Engineering Contradiction:

Improvereformatting process simplicityVSAvoiddata recording reliability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The system performs preliminary preservation of defect management information before and during physical reformatting. By maintaining the defect list intact throughout the reformatting process, the system ensures that defective sectors are identified and handled appropriately, preventing data recording failures while keeping the reformatting process simple and straightforward

Inventive Principle:

Principle #10Preliminary action

3Reliability

If substitution processing is performed for all defective sectors, then data integrity is maintained, but recording time increases due to extensive substitution procedures

Engineering Contradiction:

Improvedata integrityVSAvoidrecording time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system applies partial substitution processing by using the maintained defect list to identify only those sectors that actually require substitution during physical reformatting. Instead of performing blanket substitution on all sectors, the system selectively processes only defective sectors identified through the preserved defect management information, thereby maintaining data integrity while significantly reducing recording time

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The system uses feedback from the maintained defect list to guide substitution processing during reformatting. By continuously referring to the preserved defect information, the system can make real-time decisions about which sectors need substitution, optimizing the balance between data integrity and recording time

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS7961569B2Information recording device capable of high speed physical reformatting and recording

Publication Date: 2011.06.14 PANASONIC HOLDINGS CORP

AI summary

An information recording device is provided, which is capable of performing physical reformatting at a high speed while avoiding unnecessary substitution processing after the physical reformatting. A disc recording and reproduction drive 1020 records information on an information recording medium including a volume space for recording user data, a spare area containing a substitute area that can be used instead of a defective area, and a defect management information area for recording defect management information. The defect management information includes defect location information indicating the location of defective areas and defect status information indicating the attributes of the defective area. The information recording device includes an initialization processing module 1072 which, during the physical reformatting of the information recording medium, while maintaining at least the defect location information portion of the defect management information, overwrites said defect status information with attributes indicating that said defective area has been physically reformatted.