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Flash memory has become a popular device due to its huge-capacity, low-power consumption, non-volatility, and shock-resistance. A flash-memory storage system has replaced a hard-disk drive in many applications, especially in embedded systems. Recently, the implementation of file systems on flash-memory storage systems has become an important research topic. How to efficiently manage files and handle file accesses becomes an important issue. In this paper, we will propose a low-memory management for log-based file systems on flash memory. The experimental results show that the proposed method can provide reasonable performance under a low-memory environment.