NAND Flash文件系统的研究与改进

NAND Flash因非易失、抗震、低功耗等特点被广泛应用于嵌入式系统的大容量数据存储中。虽然随着JFFS3文件系统的提出,理论上解决了初始化文件系统时需扫描整个闪存分区、挂载时间过长、占用内存过多的缺陷，但并未解决NAND Flash本身随机读写严重不均衡的问题。在对JFFS3文件系统研究的基础上提出采用FDTree索引结构的SFFS文件系统,以解决在数据频繁更新的环境里NAND Flash数据管理问题,给出了考虑损耗均衡兼顾回收效率的垃圾回收机制。

Research and Improvement of NAND Flash File System

NAND Flash is widely used in embedded system as mass data storage due to its non-volatile,shock resistance,low power consumption.With the proposition of JFFS3 file system,the issues as scanning the whole partition to initialize the file system,the long boot time for large-sized flash memory and the high memory consumption rate are solved in theory.But the defect as random writes much slower than reads on the flash disk is not remedied.The SFFS file system with FD-Tree index structure mainly focuses on the data management problem in an update intensive environment on NAND Flash disk based on the in-