Nero without buffer

I have a problem since I changed my DVD recorder.
The problem is that it shows me the level of the recorder buffer.
I used multiple recorders Samsung SH-S223 (SATA) with no problem.
Now change the model SH-224db and since then I have this problem with the buffer of each recorder, and ruined many DVDs.
How can I fix it?

I use Nero 10 with 4 simultaneous recorders. I never had problem until you change the model.

Thanks for the help!
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