Nonvolatile Memory Controller Recovery After Power Loss
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Solution Overview
Problem
Data storage devices face challenges in efficiently recovering from sudden power-offs, particularly in updating recovery states and performing write operations on nonvolatile memory blocks, which can lead to incomplete or interrupted recovery processes.
Innovation Solution
A data storage device with a controller that performs a recovery operation based on the recovery state of a nonvolatile memory device, updates the recovery state after repairing open memory blocks, and continues write operations from the repaired position, allowing for faster recovery and continuous use of memory blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a recovery operation is performed after sudden power-off, then data integrity is improved, but recovery time increases
Solution Approach 1:
The system performs preliminary actions by maintaining a recovery state indicator that records the status of memory blocks before power-off occurs. This pre-established information allows the recovery operation to resume from the recorded state rather than starting from scratch, significantly reducing recovery time while ensuring data integrity through systematic repair of open memory blocks.
Solution Approach 2:
The system implements feedback by continuously tracking and storing the recovery state of memory blocks in a recovery state indicator. This feedback mechanism provides real-time information about which memory blocks are open or closed, enabling the controller to make informed decisions during recovery operations and optimize the repair process efficiently.
2Reliability
If repair operation is performed on open memory blocks, then reliability is improved, but operation complexity increases
Solution Approach 1:
The system applies segmentation by dividing the memory device into multiple memory blocks and tracking their individual states. The recovery operation is segmented into specific phases: identifying open memory blocks through the recovery state indicator, repairing only those specific blocks, and updating the indicator accordingly. This segmented approach simplifies the overall recovery process by focusing on specific problematic areas rather than treating the entire memory device uniformly.
Solution Approach 2:
The system implements self-service through the automatic update mechanism of the recovery state indicator. When repair operations are performed on open memory blocks, the indicator is automatically updated to reflect the new state without requiring external intervention or complex manual tracking. This self-updating mechanism reduces operational complexity by eliminating the need for separate state tracking processes.
Data Source
AI summary
A data storage device includes a nonvolatile memory device; and a controller suitable for: performing a recovery operation for the nonvolatile memory device in response to a sudden power-off based on a recovery state of the nonvolatile memory device; updating the recovery state of the nonvolatile memory device while performing the recovery operation to a predetermined recovery state after performing a repair operation for at least one open memory block of the nonvolatile memory device in the recovery operation; and performing a write operation from after a position where the repair operation is performed in the at least one open memory block, in the predetermined recovery state.