CD media
I have an Acer 2410 and I use TDK, Basf and Philips CD's. TDK burns at the speed its says were made for. But Basf and Philips supports more, for example Basf and Philips x12 support x16 and Philips x16 support x24 and the recording was ok..
In your last post I dont understand very well your question?
All CD-Recording software I know test your CD's first and then allows you to burn at the maximum speed it support. The only use of the burning speed selector is to choise a slowest burning speed.