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In this paper, the authors present the scalable and efficient flash file system using the combination of NAND and Phase-change RAM (PRAM). Until now, several flash file systems have been developed considering the physical characteristics of NAND flash. However, previous flash file systems still have a high performance overhead and a scalability problem of the mounting time and the memory usage because, in most case, the metadata is written with several words at a single update even though the writes in NAND flash must be performed in terms of page, which is typically 2 KiB. The proposed flash file system called PFFS uses PRAM to mitigate the limitation of NAND flash.
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