I don't know the answer, but it's not required to emulate an optical drive. Modern UEFI BIOSes can natively boot from USB sticks, they can save settings and sc

I don't know the answer, but it's not required to emulate an optical drive. Modern UEFI BIOSes can natively boot from USB sticks, they can save settings and screenshots to the USB stick (thus they are not mounted read-only).