I can tell you, the problem is not your new TDK cd-rewriter. I have the same problem with my pioneer dvd-rom and yamaha cd-rewriter on my kr7a. Try just plug the TDK cd-rewriter on primary master and don't plug in the cd-rom in your pc at all. you might be able to get the tdk to work, if not, try uninstalling via 4-in-driver if your mobo use it. Also try disabling the disc detector that creative sb use, it can be found in the control panel.