Nero Smart Burn

I have Nero 5.5.9.13 with a Lite on CD RW 52X.

In Nero, when I looked at Recorder/choose recorder and look at the seetings for the Liteon drive, I click Option and it show the "Smart-Burn" box is checked, while the "buffer underrun protected" is checked but the whole thing greyed out.

When I burn a cd, it says "buffer underrun protection activiated", why won't it activate the "smart burn"? or are these two virtually the same?

Thanks in advance.

 

Same feature, different name.