Dynamic Parity Scheme for Memory Reliability
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Solution Overview
Problem
Existing memory systems face challenges in dynamically adjusting the reliability and capacity of data storage as the memory device's lifecycle progresses, leading to decreased data retention characteristics over time.
Innovation Solution
The memory system dynamically configures the quantity of pages in each block of memory cells that store parity information based on conditions such as access operations and error detection, thereby adjusting the reliability and capacity of data storage in response to changing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed quantity of pages store parity information throughout the memory device's lifecycle, then the data storage capacity remains constant, but data reliability decreases over time as the memory device ages
Solution Approach 1:
The patent implements a dynamic parity scheme where the quantity of pages storing parity information is adjusted over time based on the memory device's lifecycle and observed error rates. The system transitions from a static configuration to a dynamic one, increasing parity pages when errors are detected and decreasing them when the device is reliable, thereby resolving the contradiction between maintaining high reliability and preserving storage capacity.
Solution Approach 2:
The system changes the parameter of parity page quantity based on operational conditions. By monitoring error rates and device age, the system adjusts the number of parity pages dynamically, allowing the same physical memory to provide different levels of protection at different times, thus balancing reliability and capacity throughout the device's lifecycle.
2Reliability
If more pages are allocated to store parity information, then data reliability improves, but data storage capacity decreases
Solution Approach 1:
Rather than allocating a fixed number of parity pages, the system dynamically adjusts the quantity of parity pages based on actual device performance and error rates. This allows the system to use more parity pages only when necessary (when errors are detected), and conserve storage capacity when the device is operating reliably, thus resolving the trade-off between reliability and capacity.
3Quantity of substance
If fewer pages are allocated to store parity information, then data storage capacity increases, but data reliability decreases
Solution Approach 1:
The system changes the parity page quantity parameter dynamically rather than using a fixed allocation. This allows the system to maximize storage capacity during periods of high reliability while automatically increasing parity protection when errors are detected, thus achieving both high capacity and high reliability at different times in the device's operation.
Data Source
AI summary
Methods, systems, and devices for a dynamic parity scheme are described. A memory system may include a memory device with multiple blocks of memory cells, where each block includes a first quantity of pages of memory cells storing data and a second quantity of pages of memory cells storing parity information associated with the data. In some cases, the memory system may increase the quantity of pages in a block of memory cells storing parity information to improve a reliability of the data stored in the block of memory cells. For example, the memory system may increase the quantity of pages storing parity information at the block of memory cells after performing a threshold quantity of access operations at the block of memory cells or in response to detecting more than a threshold quantity of errors in data stored at the block of memory cells.