Unable to disable optical test

[akira82]

I'm getting the following error when trying to run the test:

The optical disk test is selected, but no optical drives are specified.
At least one optical drive must be specified,
or the optical drive test turned off.

I've tried setting optical disk test mode to "NO TEST", in configuration, but this error persists.

Why?

[David (PassMark)]

You can set the Optical disk test mode in the "Optical disk" preferences window. Or turn the test off entirely from the duty cycle window.