中文摘要：

随着多媒体技术和网络技术的快速发展，融合数字录像、DVD播放、视频点播和网络共享等功能的DVD录像机（DVD Recorder：DVR）正成为新的研究热点，DVR网络信息共享也越来越受到人们的重视。通过分析DVR文件存储和文件访问的特点，在现有的TCP／IP协议和FAT32文件系统的基础上，针对DVR设计了一种高性能的DVR网络文件系统DNFS（DVR Network File System）。在百兆以太网环境下对DNFS性能进行了测试，测试结果表明，DNFS随机读的性能同SMB（Server Message Block Protoc01）相接近，而DNFS顺序读的性能要比SMB高10-20％左右。

英文摘要：

With the rapid development of the multimedia technology and network technology, integrating the functions of digital recorder, DVD playback, video on demand and network share, ete, DVD Recorder is becoming a new research focus, the network information sharing of DVD Recorder is paid more attention to. On the basis of TCP/IP protocol and FAT32 file system, through analyzing the characteristics of file storage and file access of DVD Recorder, a kind of high-performance network file system which aiming at DVD Recorder is designed. The performance of DVD Recorder is tested under the environment of 100M Ethernet, the test result shows, that the performance of randomly reading of the network file system and Server Message Block Protocol （SMB） are similar, and the performance of sequentially reading is about 10-20% higher than SMB.