Unionfs but what do you really want. Unionfs puts all the dirctories in one directory to work as one. Maybe you want to use mount --bind to have that directly bind to another. For example if x is bind to y, when a user access y they are accessing x. <div class="gmail_quote">On May 23, 2012 11:41 AM, "Norman Silverstone" <<a href="mailto:norman@littletank.org">norman@littletank.org</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> On an external HDD I have a folder called myfile, for example. On an internal HDD I have a folder also called myfile. What I want to do is to add the contents of one folder to the contents of the other. What is the best way to do this, please. Norman -- xubuntu-users mailing list <a href="mailto:xubuntu-users@lists.ubuntu.com" target="_blank">xubuntu-users@lists.ubuntu.com</a> Modify settings or unsubscribe at: <a href="https://lists.ubuntu.com/mailman/listinfo/xubuntu-users" target="_blank">https://lists.ubuntu.com/mailman/listinfo/xubuntu-users</a> </blockquote></div>