Can it be possible to disabled F12 key on boot sequence?

Hi,
Lenovo G570
Can it be possible to disabled F12 key on boot sequence.
I want to avoid the use of CD for booting.

I have the bios provided with a supervisor password (SVP).
At the moment I can with SVP press F12 at boot loose, the boot sequence to
Make CD and boot the computer from CD. I will indeed preventaccurate.

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