Direct Data File System for Flash Memory Fragmentation
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Solution Overview
Problem
Flash memory systems face inefficiencies in data storage and retrieval due to fragmentation and the need for frequent data consolidation, which degrades performance and endurance, especially when storage capacity is close to the addressable limit by the host.
Innovation Solution
Implementing a direct data file management system that allocates data within flash memory systems or hosts to limit the number of memory blocks per file, reducing fragmentation by mapping logical blocks to physical blocks with similar storage capacity, and allowing for efficient data reclamation and storage optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data is stored using traditional file systems with logical address spaces, then data can be addressed and accessed, but data fragmentation occurs and frequent consolidation is needed which degrades performance
Solution Approach 1:
The patent extracts the file system layer and logical address space management from the storage system, allowing raw data to be written directly to flash memory blocks without traditional file system overhead. This eliminates the need for file system journals, allocation tables, and consistency checks that cause fragmentation and require frequent consolidation operations.
Solution Approach 2:
The patent segments data into fixed-size blocks that map directly to physical flash memory blocks. Each block is independently addressable and can be managed separately, allowing efficient wear leveling and garbage collection without the fragmentation issues of traditional file systems that allocate variable-sized files across multiple blocks.
2Quantity of substance
If storage capacity is increased to approach the addressable limit, then more data can be stored, but the need for data consolidation increases which degrades performance and endurance
Solution Approach 1:
The patent performs preliminary wear leveling and block management when data is first written to the system. By pre-distributing data across available blocks and maintaining a mapping structure at initialization, the system avoids the need for frequent consolidation operations that would otherwise be required as storage fills up, thereby extending flash memory endurance.
Solution Approach 2:
The system implements self-managing block allocation and wear leveling algorithms that automatically balance data distribution across flash memory blocks without external intervention. This self-service approach continuously optimizes the storage layout, preventing fragmentation accumulation and reducing the frequency of consolidation operations even as storage capacity approaches the addressable limit.
3Manufacturing precision
If data consolidation operations are performed frequently to manage fragmentation, then storage efficiency is maintained, but operational speed decreases
Solution Approach 1:
The patent implements continuous wear leveling and background data distribution algorithms that operate continuously at low intensity rather than performing frequent batch consolidation operations. This maintains storage efficiency through steady-state optimization while minimizing disruption to read/write operations, thereby preserving operational speed.
Solution Approach 2:
The system dynamically adjusts data allocation and block management strategies based on current storage conditions, access patterns, and flash memory wear state. This dynamic adaptation allows the system to maintain high storage efficiency without resorting to frequent full consolidation operations, as the management algorithms continuously optimize the data layout in response to changing conditions.
Data Source
AI summary
Data files are assigned addresses within one or more logical blocks of a continuous logical address space interface (LBA interface) of a usual type of flash memory system with physical memory cell blocks. This assignment may be done by the host device which typically, but not necessarily, generates the data files. The number of logical blocks containing data of any one file is controlled in a manner that reduces the amount of fragmentation of file data within the physical memory blocks, thereby to maintain good memory performance. The host may configure the logical blocks of the address space in response to learning the physical characteristics of a memory to which it is connected.