Memory Sub-System Storage of Video Data and File System Metadata
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Solution Overview
Problem
Current memory sub-systems face challenges in efficiently storing video data and file system metadata, particularly in vehicles, where video data requires higher data density and lower data retention, while file system metadata needs lower data density and higher retention, which existing approaches often compromise due to wear leveling and storage efficiency considerations.
Innovation Solution
The solution involves configuring memory sub-systems to store video data at higher data densities and file system metadata at lower data densities by using different modes of memory cells, such as Single-Level Cell (SLC) for metadata and Multi-Level Cell (MLC) or Quad-Level Cell (QLC) for video data, and implementing separate wear leveling to maintain data integrity and retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If video data and file system metadata are stored together in the same memory blocks with uniform data density, then storage efficiency is improved, but data retention and reliability deteriorate
Solution Approach 1:
The patent divides the memory sub-system into separate first memory blocks dedicated to file system metadata and second memory blocks dedicated to video data. This segmentation allows each type of data to be stored with appropriate data density characteristics, preventing the uniform treatment that compromises reliability.
Solution Approach 2:
The patent applies different data density modes to different memory blocks: lower data density (e.g., SLC) for metadata blocks to ensure high retention, and higher data density (e.g., MLC, TLC, or QLC) for video data blocks to maximize storage efficiency. This local differentiation resolves the contradiction by optimizing each region for its specific requirements.
2Quantity of substance
If file system metadata is stored at higher data density to maximize storage capacity, then storage density is improved, but data retention and reliability worsen
Solution Approach 1:
The patent designates specific first memory blocks for metadata storage and configures them to operate at lower data density modes (such as SLC), while allowing second memory blocks for video data to operate at higher data density modes (MLC, TLC, QLC). This ensures metadata retains high reliability while video data achieves maximum storage density.
Solution Approach 2:
The patent changes the operational parameters of different memory blocks by assigning different data density modes to metadata versus video data blocks. This parameter differentiation allows the system to optimize storage density for video while preserving data retention for metadata.
3Duration of action of stationary object
If wear leveling is applied uniformly across all memory blocks, then device lifespan is improved, but storage efficiency for video data deteriorates
Solution Approach 1:
The patent separates metadata blocks from video data blocks and applies wear leveling selectively: uniform wear leveling across all blocks to extend device lifespan, while preserving the ability to use higher-density modes in video blocks for efficient storage.
Solution Approach 2:
The patent implements a dual-mode wear leveling strategy that serves multiple functions: it protects metadata blocks with conservative wear leveling to ensure longevity, while allowing video data blocks to utilize higher data density modes for efficient storage, achieving both device lifespan extension and storage efficiency.
Data Source
AI summary
A memory sub-system can allocate a first portion of blocks of a memory device for storage of file system metadata based on a file system and a capacity of the memory device, write video data received from a host within a second portion of the blocks at a first data density, and write file system metadata within the first portion of the blocks at a second data density lesser than the first data density.