I have on an old 586 (Win98) two data files called E:\data\ with about 25 subdirectories and a total of 300 files and E:\data-1\ with about 30 subdirectories and a total of about 400 files Now I intend to amalgamate E:\data into E: data-1 and I was thinking of using xcopy E:\data\*.* E:\data-1\*.* /s but my question is: "if file in E:\data\ already exists in E:\Data-1\= do not copy" what is the proper DOS syntax to achieve this? Thank you for your input. Charles.