Defect List Management for Quick Storage Media Re-initialization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The re-initialization of rewritable information storage media can be time-intensive when all blocks or defect blocks are determined as defective through the verify-after-write process, leading to inconvenience for users.
Innovation Solution
A method and apparatus for quick re-initialization of information storage media that involves managing defect blocks and replacement blocks by seeking and certifying defect entries in a defect list, deleting entries without certification, and updating state information to indicate defect or replacement block status without requiring a verify-after-write process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a verify-after-write process is performed to determine defect blocks during re-initialization, then the reliability of defect detection is improved, but the re-initialization time becomes excessively long
Solution Approach 1:
The patent applies preliminary action by performing a quick re-initialization without the traditional verify-after-write process. The defect blocks are identified and managed through a different mechanism (using defect lists and replacement blocks) before actual data recording, allowing the re-initialization to complete quickly while still ensuring data integrity through alternative defect management methods.
Solution Approach 2:
The patent segments the defect management process into distinct components: defect identification during quick re-initialization, defect registration in a defect list, and replacement block allocation. This segmentation allows the re-initialization process to proceed quickly without waiting for verify-after-write completion, while defect management continues through other mechanisms.
2Loss of information
If all blocks are checked through verify-after-write process during re-initialization, then complete defect information is obtained, but the operation complexity and time consumption increase significantly
Solution Approach 1:
The patent extracts the defect verification step from the re-initialization process. Instead of performing verify-after-write on all blocks during re-initialization, the system extracts defect information through quicker methods and manages it separately through defect lists and replacement blocks, simplifying the re-initialization operation while maintaining defect information integrity.
Solution Approach 2:
The system performs preliminary defect identification through quick re-initialization without complete verification, then handles defect management separately. This preliminary action allows re-initialization to complete quickly while defect information is gathered and managed through alternative mechanisms that don't block the re-initialization process.
3Reliability
If defect blocks are managed with replacement blocks, then data recording reliability is improved, but the defect list management complexity increases
Solution Approach 1:
The patent implements self-service by automatically managing replacement blocks and defect lists without requiring manual verification or complex user intervention. When a defect block is identified, the system automatically allocates a replacement block and updates the defect list, ensuring data recording reliability through automated defect management while keeping the process simple for users.
Data Source
AI summary
A method of determining whether a defect exists on an information storage medium is provided along with a recording/reproducing apparatus using the same. Such a method comprises: seeking a defect entry whose state information indicates that a defect block or a replacement block has been re-initialized without certification from a defect list for managing an information storage medium and including state information of the defect block and state information of the replacement block, wherein the medium includes a spare area for recording the replacement block to replace the defect block occurring in a user data area on the medium; and certifying the defect block or the replacement block registered in the sought defect entry. As a result, defect information can be effectively rearranged for quick re-initialization without certification in order to improve the performance of a drive system.