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Since the existing NAND flash memory file systems manage file data in page units, the memory usage increases greatly as the number and size of files increase, and the area to scan at the mounting time increases linearly as well. To resolve these problems, this paper suggests data management in segment units for more efficient processing of multimedia files to reduce memory usage and to improve reading and writing performance. In addition, it suggests a new index structure and garbage collection method for multimedia files to reduce the mounting time and to improve the wear-leveling effectiveness. This approach shows better performance for multimedia files than existing file systems in terms of reading, writing, memory usage, mounting time, and garbage collection.