磨损均衡算法在NAND Flash管理中的改进

由于Flash具有擦除次数有限、先擦后写的特点,会带来使用寿命有限的缺陷。为延长其预期使用寿命,普遍采用磨损均衡算法对各存储单元进行管理。该算法核心在每次写操作时将新数据写入到最少被使用的物理块中。本文对该算法在垃圾回收策略和对静态文件管理方式做出改进。垃圾回收时在遵照磨损均衡原则的前提下提高写入数据效率,同时增强该算法对不同类型的文件存储单元管理能力,从而达到更加有效的磨损均衡。

The improvement of wear-Leveling Algorithm in NAND Flash management

Flash memory has some characters such as limited erase cycle, erase before write, which bring some disadvantages on the flash expect lifetime., This document doing some improvements on garbage collection algorithm and static data management in order to extend its lifetime. In garbage collection process, the improvement can increase the data input rate in accordance with the wear-leveling. On the other hand, the improvement can enhance the management of wear-leveling algorithm to different types of files in the flash, achieve more efficient wear-leveling.