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NAND flash memory-based storage devices are becoming an attractive storage solution for multimedia storage servers because they afford several advantages including fast read access speed and low power consumption. Multimedia storage devices differ significantly from traditional storage devices in that the user files are accessed in a sequential read manner while metadata are updated frequently. In this paper, we propose a new flash translation layer (FTL) scheme called filtering FTL (FFTL) for nand flash-based multimedia storage devices. The main idea of the FFTL scheme is to filter update requests for metadata and manage them separately from requests for user data. Our experimental results show that the proposed FFTL scheme outperforms existing FTL schemes by dramatically reducing the garbage collection overhead.
Date of Publication: June 2011