Why my Sony U-18A does not support test mode?

i have a SONY U-18A updated to LITE-ON 832S, and im using recordNow max and nero but they say that my burner does not support test mode, is this normal?? im having problems with dvd-rw sony media cos im not able to record and i dont know whats wrong???

‘Plus’ media can’t be simulated. Only ‘dash’. This is due to media, not drive.

Also, Nero can be a little quirky. For a while, it was reporting that I can’t simulate my ‘dash’ media even when I could. Using DVD Decrypter, I was able to do so again.

thaks for your help i would try with DVD-R