Enhancing Endurance of Huge-Capacity Flash Storage Systems by Selectively Replacing Data Blocks

Wei-Neng WANG  Kai NI  Jian-She MA  Zong-Chao WANG  Yi ZHAO  Long-Fa PAN  

IEICE TRANSACTIONS on Information and Systems   Vol.E95-D   No.2   pp.558-564
Publication Date: 2012/02/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.E95.D.558
Print ISSN: 0916-8532
Type of Manuscript: PAPER
Category: Computer System
wear leveling,  flash memory,  selective replacement,  huge-capacity storage systems,  

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The wear leveling is a critical factor which significantly impacts the lifetime and the performance of flash storage systems. To extend lifespan and reduce memory requirements, this paper proposed an efficient wear leveling without substantially increasing overhead and without modifying Flash Translation Layer (FTL) for huge-capacity flash storage systems, which is based on selective replacement. Experimental results show that our design levels the wear of different physical blocks with limited system overhead compared with previous algorithms.