def METHOD_NAME(ftsFiles, preferDisk=False):
    succ = {}
    failed = {}
    for ftsFile in ftsFiles:
        if hasattr(ftsFile, "fakeAttr_possibleSources"):
            succ[ftsFile.lfn] = dict.fromkeys(getattr(ftsFile, "fakeAttr_possibleSources"))
        else:
            failed[ftsFile.lfn] = "No such file or directory"
    return S_OK({"Successful": succ, "Failed": failed})