Since almost all OS distributions are released as ISO images, either setup CD or Live CD. Normally we need to burn the ISO image to optical disk or USB disk, but CD drives are die out and USB disk may not be compatible for a successful boot up. It will be extremely good if user can boot computer from any of these CD images with great ease. I know GRUB can load an ISO file, but once the OS on it takes over the CPU the CD no longer exists, you know, this have many restrictions . What we want is a virtual CD drive comparable to that provided by a virtual machine software(e.g. VirtualBox). So I wonder whether a virtual CD drive implemented at BIOS level can persist even after OS is boot up?
I wonder whether a virtual CD drive implemented at BIOS level can persist even after OS is boot up?
Sure. Study System Management Mode. It can be used to virtualize hardware of many kinds, including an optical PATA drive.
My guess is that you will have to implement it yourself.