I want to move all my music and photos from the hard drive to a new external drive. I also want to be sure that whenever I purchase music online or download photos or cd those files will automatically go to the external drive. How do I do this? Thanks

For your first question - assuming you are using Windows - navigate to the directory on your hard drive where the music currently is stored (perhaps in "My Music"), right click on the directory name and choose "Cut." Then navigate to the hard drive directory where you wanat to put this directory, right click, and select "Paste." Alternatively, you can use "Copy" and "Paste" if you want to leave a copy of the music in its original directory.

As for your second question - it depends on how you are purchasing your music. Are you using iTunes, or what? If using a web browser like Internet Explorer it should "remember" the directory that you last browsed to when downloading a file, so after you navigate to the external drive the first time, from then on it should go there automatically .