I would try 24x CD-RW media.
Your Artec WRR-52Z should be supported by the latest version of Nero (since it appears in InCD's database, and it's bundled with Nero, at least in Europe). Thus, unless you already have it, you should upgrade to version 22.214.171.124 from Ahead's site (www.ahead.de
You may try to find more detailed specifications for your drive at www.ultima.com.tw
(the site was so slow that I resigned after a couple of minutes).