DFS Data Loss

Hi, I am facing a typical problem in DFS system Server 2008, Particular folder configured under DFS is not having data, 139gb of data just vanished. There is no event in the event viewer. I have 10 other folders in the same DFS setup, they are working normal and the data is also intact. I don’t understand why this particular folder data is lost. What might be the cause and how to get back the data. Thanks, Jeejan