Hallo Kuddel,
und noch die Zweite Variante:

you can also graphically retrieve OS/400 IFS directory sizes through the OpsNav program that comes with Client Access Express for Windows V5R1. Using OpsNav, open the File Systems-Integrated File System node, and follow the OS/400 IFS tree down until you find the directory that you want to size. Right-click on that directory and select the Properties option from the pop-up menu that appears. On the Properties panel, the directory size will be listed in the Total data size field under the panel's General tab. To see the number of folders (directories) and files the directory contains, click on the Storage tab of the Properties panel, and that information will also be displayed. Like EDTF's Path Size option, OpsNav calculates these sizes on the fly, so you may have to wait when it calculates the size of an extremely large directory. And--also like EDTF--it's very simple to inadvertently delete files or directories with OpsNav, so be very careful with the user profile authorities of any user that accesses this function.
gruss TARASIK