Flash Memory Block Group Segmentation for Defective Block Management
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Solution Overview
Problem
Multiple data channel flash memory storage devices face efficiency and lifespan issues due to defective blocks, as existing methods either reduce write speed or require entering read-only mode or retiring the device.
Innovation Solution
The method involves detecting defective blocks in block groups, dividing them into subgroups containing only defective or good blocks, and reorganizing these subgroups to form new block groups for efficient data storage, maintaining the original block size and improving device efficiency and lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If all data channels are used simultaneously for data transmission, then write speed and efficiency are improved, but the device cannot handle defective blocks and may require entering read-only mode or retiring the device
Solution Approach 1:
The patent segments block groups into subgroups based on the status of data channels. When a defective block is detected in a block group, the system divides the block group into subgroups, isolating the defective block from functional blocks. This allows the functional subgroups to continue being used for data storage, maintaining device productivity while managing defective blocks effectively.
Solution Approach 2:
The patent implements dynamic management of data channels by detecting defective blocks in real-time and adjusting the configuration of block groups accordingly. The system dynamically reconfigures block groups to exclude defective blocks while maintaining the desired block group size for efficient data transmission, ensuring both high productivity and continuous device operation.
2Reliability
If defective blocks are skipped in write operations, then data can be stored in functional blocks, but write speed is retarded and efficiency is reduced
Solution Approach 1:
The patent performs preliminary detection of defective blocks during manufacturing or initial operation and records their locations in advance. This preliminary action allows the system to pre-configure block groups that exclude known defective blocks, so that during normal write operations, the system can maintain high efficiency without needing to detect and skip defective blocks in real-time.
Solution Approach 2:
The system automatically manages defective blocks by detecting them and reconfiguring block groups without requiring external intervention or complex real-time decision-making during write operations. The flash memory controller autonomously handles the reconfiguration to maintain write efficiency while ensuring data is stored only in functional blocks.
3Duration of action of stationary object
If block groups are reorganized to exclude defective blocks, then device lifespan is extended, but the complexity of block management increases
Solution Approach 1:
The patent changes the organizational parameters of block groups by adjusting which blocks are included or excluded based on their functional status. When defective blocks are detected, the system modifies the block group configuration to maintain the desired group size while excluding defective blocks. This parameter change approach extends device lifespan through systematic reorganization without requiring fundamentally complex management mechanisms.
Data Source
AI summary
The block groups of a multiple data channel flash memory storage device are detected for defective blocks. The block group containing any defective blocks is divided into subgroups, each of which contains only defective blocks or only good blocks. The subgroups containing only good blocks are selected to establish a new block group having the same amount of blocks as that of the original block groups.