NAND Flash文件系统方案及其可靠性设计

NAND Flash具有高存储密度和高存储速率的特点,在嵌入式系统领域得到了广泛应用,如何使其文件系统的性能最优化成为本文讨论的主题。本文首先提出文件系统的设计方法,主要阐述面向嵌入式应用的FAT文件系统;接着,针对NAND Flash存在固有的坏块这一弱点,为了提高整个系统的可靠性,提出一种利用嵌入式文件系统进行坏块处理的策略,核心思想为利用Flash存储器上未使用空间来代替坏块,同时,在FAT表中标记出损坏的坏的信息,避免以后对坏块进行读写。本策略经项目的具体应用证明,具有较高可靠性。

A Design of File System and Reliability about NAND Flash

Nand flash become widely used in embedded system because of high memory density and high memory speed, So how to improve quality of Nand Flash file system is a main subject in this paper. First this paper present the design method of file system , main about FAT file system in embed system, And then a new method of dealing with the bad block is also introduced in this paper to get over the hindrance. The method is that replaces the bad block with free space on the flash. Bad blocks marked in the file allocation table are never used again. It has been carried out in a project with high stability.