Nonvolatile Memory Controller Integrity Check for Data Loss Prevention
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Solution Overview
Problem
Data storage devices face challenges in efficiently managing memory blocks and ensuring data integrity, particularly during sudden power-offs, leading to potential data loss and increased wear on memory components.
Innovation Solution
A data storage device with a nonvolatile memory system that includes management blocks and a controller for managing memory blocks, where the controller designates new blocks for storing management data, checks integrity, and performs recovery operations based on the state of current management blocks to minimize data loss and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the controller performs full recovery operations on all management blocks, then data integrity is improved, but memory wear increases
Solution Approach 1:
The patent changes the parameter of recovery operation scope from 'all management blocks' to 'specific management blocks based on integrity check results'. The controller performs integrity checks on management blocks and selectively performs recovery operations only on blocks that fail the integrity check, thereby reducing unnecessary write operations and extending memory lifespan while maintaining data integrity.
2Reliability
If the controller checks integrity of all management blocks, then data loss prevention is improved, but processing time increases
Solution Approach 1:
The patent applies partial action by performing integrity checks selectively rather than on all management blocks. The controller checks integrity of management blocks that are candidates for recovery operations, which is sufficient to prevent data loss while reducing the overall processing time compared to checking all blocks.
3Duration of action of stationary object
If the controller performs selective recovery operations, then memory wear is reduced, but data integrity risk increases
Solution Approach 1:
The patent implements feedback through integrity check results that guide recovery operation decisions. The controller checks the integrity of management blocks and uses this feedback information to determine which blocks require recovery operations. This feedback mechanism ensures that selective recovery operations maintain data integrity by targeting only the blocks that actually need recovery.
Data Source
AI summary
A data storage device includes a nonvolatile memory device including a plurality of memory blocks and a controller for controlling the nonvolatile memory device. A plurality of management blocks includes first and second management blocks managed by the controller. The second management block stores start data and then stores integrity data. The first management block stores a storage location of the second management block. An integrity checker checks integrity of data associated with the first and second management blocks.