Is it Benq write in CAV type?But mine

I’m test it with create date disc using nero cd speed,but it show me write in CLV type.Anyone can explain for me why it write in CLV but not CAV.
Please help,thank you.

The drive can directly start @4x write speed, which is the (max.) writing speed you have selected. So what did you expect the graph to look like ? :). Select 8x writing on media that allows this and you will see CAV.