Today, flash memory are strongly used in the embedded system domain. NAND
flash memories are the building block of main secondary storage systems. Such
memories present many benefits in terms of data density, I/O performance, shock
resistance and power consumption. Nevertheless, flash does not come without
constraints: the write / erase granularity asymmetry and the limited lifetime
bring the need for specific management. This can be done through the operating
system using dedicated Flash File Systems (FFSs). In this document, we present
general concepts about FFSs, and implementations example that are JFFS2, YAFFS2
and UBIFS, the most commonly used flash file systems. Then we give performance
evaluation results for these FFSs.Comment: Colloque du GDR SoC-SiP, Paris : France (2012