http://www.cool4u2view.com/Neuros_files/Page721.htmlThis site shows how to replace the harddrive as well as listing disk models that will work. The instructions are quite good. Just make sure you have the right tools. Torx screwdrives are not common in most folks' toolbox
I replaced the old 20 GB disk with an 80 GB disk using a Hitachi Travelstar.
Popping the cover back in place was a little tricky, but that was the only part that was tricky. This site mentions that you may have to format the drive using a DOS window to get the. I formatted mine using the format command on the Neuros.