If I run this command it works fine E: cd E:\intellij\j6m\src\com copy /UF /S /E /T *.java E:\com However, if I run it again immediately afterward, it STILL copies all the same files over again. Can anyone think of what might be causing this? Take Command started doing this a week or so ago. It also happens with /U and without the /E and without the /T. I am running Vista Home premium on an NTFS partition.