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Journal of Information Science and Engineering, Vol. 23 No. 6, pp. 1865-1887 (November 2007)

Design, Implementation, and Performance Evaluation of Flash Memory-based File System on Chip*

Seongjun Ahn, Jongmoo Choi, Donghee Lee, Sam H. Noh, Sang Lyul Min and Yookun Cho
Department of Electrical Engineering and Computer Sciences
Seoul National University
Seoul, 151-742 Korea
1Division of Information and Computer Science
Dankook University
Seoul, 140-714 Korea
2School of Computer Science
University of Seoul
Seoul, 130-743 Korea
3School of Information and Computer Engineering
Hongik University
Seoul, 121-791 Korea

Interoperability is an important requirement for portable storage devices that are increasingly being used to exchange and share data among diverse hosts. However, interoperability cannot be provided if different host systems use different file systems. To address this problem, we propose a storage device that contains a file system within itself, which we refer to as FSOC (File System On Chip). In this paper, we explain the design and implementation of a Flash memory-based FSOC as a proof-of-concept. We also propose a performance model for FSOC, which is derived by analyzing operations of the host and storage device. Using this model, we show that aside from qualitative benefits, there are quantitative benefits in using FSOC instead of a conventional storage device. Results from a series of experiments are given that compare the performance of a conventional storage device and the FSOC using synthetic workloads as well as real applications, which verifies the proposed model.

Keywords: embedded system, file system, flash memory, interoperability, portable storage

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Received November 3, 2005; revised January 27 & May 29, 2006; accepted July 19, 2006.
Communicated by Tei-Wei Kuo.
*This research was partly supported by grant No. R01-2004-000-10188-0 from the Basic Research Program of the Korea Science & Engineering Foundation and in part by MIC & IITA through IT Leading R&D Support Project.