The result shows that rolling contact fatigue failures caused swap block defects of rail .

结果表明， 掉 块缺陷的形成是由于钢轨滚动接触疲劳伤损所致。

This paper discusses the basic architecture and principle of RFD based on USB . Especially it explains the process of data transfer between PC and RFD data interim storage and swap technology and bad block processing technology .

该文探讨了基于USB的可移动闪盘的基本结构和原理，着重阐述了PC与闪盘设备之间的数据传输过程，以及数据暂存与 交换技术和Bad Block处理技术。

Analysis on Swap Block on Tread of 50 kg / m Rail

50kg/m钢轨踏面 掉 块缺陷分析