first of all, I deeply apologise because of my silly question. The thing is that I am learning about hardening. I have VMware workstation 12, and I've created a VM CentOS 7 machine (to be integrated in a MySQL virtual server).
What I need is to prevent booting the VM from media devices (USB and CD/DVD.... by the way, is it possible to boot from VGA or HDMI ports?). I've searched too long in the web, and I've found that it is possible by configuring it in the BIOS/UEFI. The thing is that I don't understand how to do it... Is it possible to reach it from the virtual machine? (if yes, how?). I do not want to disable USB, nor remove USB drivers (let's say, for example, that I do want it to make periodical back ups). I only want to disable USB booting, everything else from peripherical devices can be drivers removed, because they do not serve any function to the system.