Flash Memory Error Handling Using RAID-Scoped Data Relocation
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Solution Overview
Problem
As storage density increases in flash memory devices, the size of blocks also increases, leading to a significant amount of data needing to be moved due to decoding failures, which strains the limited write/erase cycles and affects data integrity and device lifespan.
Innovation Solution
An error handling mechanism that moves only data associated with the same RAID verification data during decoding or programming failures, reducing the amount of data moved and improving efficiency while extending the flash memory's lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all data in a block is moved in response to decoding failure, then data security is ensured, but the amount of data to be moved increases significantly
Solution Approach 1:
The patent segments the data movement operation by using RAID verification data to identify and move only the specific data units associated with the verification data that failed decoding, rather than moving all data in the block. This segmentation allows selective data relocation based on the actual error scope.
Solution Approach 2:
The patent applies local quality by treating different data units differently based on their association with failed verification data. Only data units linked to the failed RAID verification data are moved, while other data units remain in place, creating a localized error handling approach rather than a blanket block-wide operation.
2Reliability
If all data in a block is moved in response to decoding failure, then data security is ensured, but the time required for error handling increases
Solution Approach 1:
The patent segments the error handling process into two phases: first identifying which specific data units are associated with failed verification data using RAID parity information, then moving only those identified units. This segmentation reduces the total time required compared to moving all data in the block.
Solution Approach 2:
The patent performs preliminary identification of affected data units using RAID verification data before executing the data movement operation. This preliminary action allows the system to precisely determine the scope of data that needs to be moved, avoiding unnecessary movements and reducing overall handling time.
3Reliability
If all data in a block is moved in response to decoding failure, then data security is ensured, but the lifespan of flash memory is reduced
Solution Approach 1:
The patent segments the data movement operation to affect only specific data units associated with failed verification data rather than all data in the block. This reduces the cumulative wear on flash memory cells from repeated write/erase cycles, thereby extending device lifespan while maintaining data security for the affected units.
Solution Approach 2:
The patent applies local quality by differentiating between data units that require movement (those associated with failed verification data) and those that do not. This localized approach minimizes unnecessary write operations to memory cells, reducing wear and extending the operational lifespan of the flash memory device.
Data Source
AI summary
An error handling method for use in a flash memory includes: in response to read data on which a decoding failure occurs or written data on which a programming failure occurs, determining verification data corresponding to the read data or the written data; according to the verification data, selecting data to be moved from the flash memory; and performing a data movement operation to move the data to be moved to a target storage space in the flash memory.